10CSC movement to case fitment issues

How to add images to myBulova.com forums & comments

Submitted by VTTime on

I'm a new member here and this is my first post.  

I'm repairing a 10CSC that doesn't have any case screws and I'm not sure it's fit to the original case.  There doesn't appear to be any way to seat the movement firmly.  Pictures of a #46 case screw look like it won't work with the current movement ring.  I gather that the 10CSC is from 1952-1954.  There is no case ID stamped on the inside of the back cover. Back cover's s/n is g319xxx M9.  Does this date the case to 1969?  Currently I believe the movement ring fits up against the back of the dial on one side and the case back on the other side, with no way to interface with case screws, presumably leaving the movement free to float around a bit. It came in with a broken weight axle and the customer reports that the weight axle has broken several times in the past (I just installed a new one).  So, my questions are: 1) is this movement and case a mismatch, 2) if the parts I have are correct, do I need case screws at all?  3) Do I need a different movement ring?  I see a picture of an alternate movement ring that is supposedly designed for this movement, but it's not clear how it's tabs would function unless it's a two piece ring. I've tried to add pictures of the watch, existing and potential alternate movement rings, etc. but can't figure out how to add multiple images.  Also, the first group didn't meet the size and naming convention requirements and I can't figure out how to remove them from the upload list.

Thanks in advance for any help with this conundrum.

mybulova_admin
Posted May 18, 2026 - 7:32am

Did you say you managed to upload some images?

VTTime
Posted May 18, 2026 - 5:16pm

I could only upload one image, so I gave up ... I think I would need to upload multiple images to make sense.

VTTime
Posted May 18, 2026 - 6:09pm

I'll try adding images one at a time. Here's the back of the movement in the case:

VTTime
Posted May 18, 2026 - 6:10pm

And here's the movement ring installed over the movement (with dial on, underneath) - arrow pointing to where a case screw would nominally go.

VTTime
Posted May 18, 2026 - 6:11pm

And here's the movement ring by itself:

VTTime
Posted May 18, 2026 - 6:14pm

Here's a picture of what the movement ring should potentially look like, captured from Perrin's website.  Since the case has M9 stamped on it, is the case from 1969 and not original to the movement?  In this picture, what do the tabs bear on?

VTTime
Posted May 18, 2026 - 6:19pm

Here's a picture of the case screw location without the movement ring in place.  Note that the movement ring will bear on the backside of the dial (??weird??).

 

 

VTTime
Posted May 18, 2026 - 6:22pm

And here's a picture (correct?) of the #46 case screw.  Long threads. Head would overlap movement ring, but there would be no clearance for the rotor unless I mill out a slot so that the screw head could sit down below the rotor?

Maybe shorten the screw, turn the head into a cam shape and then use that to wedge the movement to the movement ring?

Maybe all just an issue with it being a Frankenwatch having no official Bulova solution?

FifthAvenueRes…
Posted May 23, 2026 - 4:14am

the 10CSC dates to the mid 1950's

M9 on the case indicates 1969 

JEV1A
Posted May 26, 2026 - 12:02pm

The movement must be correct for the case exactly.  I come across this often. Case makers change year to year. If the movement won't drop in easily, its wrong for the case. You would need a earlier era case I believe. John V. TIME & AGAIN centralhsd@earthlink.net  note: I have had to manipulate movements into cases not made for specific movements with decent results although non conforming. 

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