Gothamatic- AS 1250 movement

[Shoshone]

Hello, new poster here but have followed along for quite some time.  Among my projects is the service of this watch.  It is a bumper movement made by A Schild in the 40's. Apparently this movement was also used by Tudor, so it has a pedigree!   http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&&2uswk&AS_1250

First step is to get the case open.  This is a one piece 'waterproof" stainless steel piece.  Four screws compress the case and crystal against the bezel. Then you are left with the movement and the case.

The crown is "split" which means it should separate to remove the movement.  It is unclear whether you just pull hard on the crown, or manipulate it so that the link lines up and it just comes apart.  I tried yanking gently with no luck.  Manipulation did not help either.  The pictures are from the auction and other sources. 

Any ideas?  Thanks!

 

[rogart63]

Wow . A nice little bumber movement? You should be able to take the crown of by pulling hard on it. Found an old Ebay auction that had an similar watch? I see the four screw in each lug. Looks like the movement could be removed from the front? A frontloader? 

Edited June 13, 2016 by rogart63

[oldhippy]

Hello and welcome from me. Your watch has what is called a two piece stem you can see clearly by your pictures, also the stem doesn't show any signs of rust, you are right the button and part of the stem when pulled should separate and come out. Some can be hard I suggest you are not pulling hard enough. I would always use a pair of nippers to get behind the button and pull. Here is a picture of a pair of nippers, just in case you don't know what they are.

[ro63rto]

Have a look at about 1min 25secs into this video [emoji6]

Ignore the rest of it.

[Geo]

Welcome aboard!  You have already found out how helpful this place can be.

[Shoshone]

Boy, the response has been great!  I am at work in California now.  When I get home I will try with the nippers (gently).  Thanks to all.

[jdm]

Nippers are a cutting tool and better avoided when the goal is not to cut. Use a modified hand puller as in the video, or other apt tool.

[oldhippy]

56 minutes ago, jdm said:

Nippers are a cutting tool and better avoided when the goal is not to cut. Use a modified hand puller as in the video, or other apt tool.

Nippers just grab behind the button they aren't used in anyway as to cut. Safe as houses for grabbing a button on a two piece stem. 

[Shoshone]

And presto: here it is!  I used a hand remover/cannon pinion tool; pulled gently and it popped off. 

I don't know if you can see it in the pics but the winder mechanism was loose.  There are marks on the case and weight.  Looks like the bridge is held with just two screws.  It started ticking when I tightened it up, so looking promising so far! 

 

[anilv]

Hand removing levers would work. Hand removing tool like the bergeon/presto may be too flimsy.

I use nippers myself but use a cloth to prevent scratching the case.

The main idea is how easily you can control the force. Using the nippers. The force used is not so much 'clamping' the handles but more 'pulling'.

Anil