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Need Sea-Gull ST19 (Venus75 rep?) stem info

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22 replies to this topic

#1
Drulee

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I'm trying to upgrade a couple of crowns that are in place on these movements. However, I have no idea what stems they take. Someone has suggested they take same stem as the Venus75, but I have not been able to get confirmation of this.

Does anyone have the part numbers, or a link to the movement diagram, etc.?

Thx

#2
Toadtorrent

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From what I've read, the ST19 is a straight copy of the Venus 175 as they bought the machinery from the Russians to make it.

ST19 Info

"The ST1901 movement is nearly identical to the Venus 175 - parts are interchangeable. But the movement is not a copy or clone. It actually is the Venus 175, because Seagull has purchased the tooling from Venus in the early 1960ies. Seagull did copy the tooling to be able to produce at 2 locations. Differences or improvements to the Venus 175 are the increased beat (the Venus only had 18000 bph) and an added incabloc style shock absorber."

ST1901
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ST1902
http://www.tjseagull...kt/19/1902w.pdf (link to pdf diagram of ST1902

#3
hackR

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sooooo...any idea where to get a stem?!...R

#4
highoeyazmuhudee

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http://cgi.ebay.com/...=item23018a67eb

#5
RWG Technical

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The Venus stem does not fit, the only solution I know of is to make one out of an existing stem.

I have made a few of these in the past and probably have some in my spares bins...

#6
Toadtorrent

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Well that's inconvenient isn't it Zig (needing folks like you to have to machine these that is). Sheesh...and to think that a company like Seagull who sells complete watches and movements doesn't have a supply chain operation. It's sad. I had an email in to the American Seagull rep...didn't hear back. :(

Lucky to have you on the team Zig!!

#7
hackR

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Zig...

I need a stem for a seagull st-19...i have an Omega Broad Arrow seagull st-19...i pulled the crown out to set the time and ended up with the crown in my hand...the end broke off inside the crown...the crown is now soaking in white vinegar...soooo, i will need a replacment stem, Z...if my watches haven't shipped yet, can you toss one in...and let me know the cost...

Here's a question...i have an old broken FM handwind...which is seagull/venus175/whatever...definitely a silmilar movement to the one in the Omega...so i checked out the stem...the two stems are slightly different...definitely same size, but the "bulging" piece closes to the crown is different on the two...i'm not an expert and can shoot some pix later if need be...describing the stem - from crown to movement: threads, round'ish bulge1, small 1mm of thread, round'ish bulge2, stem rectangular cylinder end...

so all this said, does the stem have to be identical...or would the older, but slightly different, FM one work...

attached is a macro pix of the Omega stem...

thanks...R

Attached Files



#8
RWG Technical

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I never did try Sea Gull directly, most OEM's do not sell to individuals, they are not set up for it... and I know of no supplier that carries the Sea Gull line.

Which leaves one to do the next best thing, make your own...:)

#9
RWG Technical

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@R

Not gone out yet, did the best I could with the CG feet, it's all ready to head your way, I'll include a stem.

There can be slight differences in the stem, the critical dimensions are the tip, the square boss, and the round section with the grove for the set lever. The diameters and length of each sections are what you need to compare, if it came from the same type of movement I would try it out and it should work just fine.

#10
hackR

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I just took some quick pix of the stems...i tried to line them up as best i can...the bottom one is slightly farther to the right than the top one...

The top one is the stem from the Omega seagull st-19 (per by-tor review of this watch)

The bottom one is the stem from the FM Casablanca handwind (josh has these listed as venus 75?!?!...is there a 75 or is this a typo for 175?...

any info/advice/learnings is appreciated, Z!...i didn't want to "try it out" if its wrong...don't want to screw up the movement...pls let me know what you think...

R-


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#11
RWG Technical

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The bottom one looks "right", maybe the top one is a replacement one.

The only way to be sure is to measure all the dimensions with a micrometer, looking and comparing won't do, the dimensions and tolearnaces are too small...

#12
hackR

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cool...ya know, that could be why the top one broke...

from the visual eye, the top one (the one that broke from the Omega) does look a little smaller overall than the bottom one (from the FM)...you can kinda see that from the pix, too - altho i held the camera close and took a macro shot - so there is an optical difference in the pix, too...all in all the two are close, but the bottom one is larger overall...

i also discovered that the crown didn't have a rubber gasket in it before i put it in the vinegar...is there a source for this, somewhere...

ahhhhh - the joys of this hobby...

R...thanks for your expertise and advice!...

R-

#13
Drulee

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Don't sell off those ST-19 stems The Zigmeister, I've accumulated four watches with this movement, and bought a Daytona homage (UGHH! I hate Rolexes) with one it for spare parts - just in case :) So you know if anything ever goes wrong with these, they are off to you :D

I'll have to see if the stem from that "Daytona" is salvageable. It does look kind of short though :(

#14
RWG Technical

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I don't stock these as they are special order, as well I have to machine them on the lathe to make them fit the Seagull.

I think I have a few left in the bins...

#15
Drulee

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What is the best way to remove a "Daytona" like crown from the stem?

#16
RWG Technical

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You hold the square boss in a pin vice, and simply unscrew the crown from the stem...

Using pliers is possible but only if you hold the stem by the threaded part. Pliers are risky because your not lined up when you try and unscrew, and you risk breaking the stem off in the crown.

With any watch work, the best habits to form are the right ones by using the right tools, I am not a big fan of hack or buckshee work (my appologies to hackR, I am not referring to the person, but the method) :)

I see ruined watches all the time, which is totally avoidable.

#17
Drulee

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You hold the square boss in a pin vice, and simply unscrew the crown from the stem...

Using pliers is possible but only if you hold the stem by the threaded part. Pliers are risky because your not lined up when you try and unscrew, and you risk breaking the stem off in the crown.

With any watch work, the best habits to form are the right ones by using the right tools, I am not a big fan of hack or buckshee work (my appologies to hackR, I am not referring to the person, but the method) :)

I see ruined watches all the time, which is totally avoidable.


Ah yes, the pin vice, completely forgot that I had one. Thanks.

#18
Drulee

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Just heard back from Alpha watches, and they do sell the ST19 stems. How much, you may ask? $12 for ONE stem. Looks like they've cornered the market on these, but if you really need one, there is a source.

#19
Toadtorrent

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I'm going to have 10 of them coming in soon with some spare ST19 movements. Stay tuned.

#20
pierre22

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The Valjoux 7730 401 T90 stem fit perfectly my VC Malte rep chrono. For the details on how I found out see the post on the other forum:

Here


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