Bulova Part Numbers?

[64americandeluxe]

I need a crown wheel screw for a Bulova 11ACC movement.  The Bulova part number is #40.  I consulted a Bulova cross reference catalog and the 11AC, 11ACAC & 10CBAC movements use the same, #40 crown wheel screw.

 

Online, I have found a Bulova part #40 screw which fits the 5AH movement.  My question is, would the Bulova #40 part number be the same part for all these movements?  Common sense tells me that a #40 is a #40, but I am questioning why the 5AH wasn't listed in the cross reference as using the same screw as my 11ACC.  The catalog I used was from 1959 and I suppose the 5AH may have been produced after that date.

 

Any insights?

Thank you!

Roger

 

[Geo]

Here's my take on it Roger, and I may be completely wrong.

I think the identification numbers for parts will be universally used across the range of movements, ie #40 will always refer to a crown wheel screw regardless of calibre. The calibre code that prefixes the #40 will be the important number, as the crown wheel screws for different calibres will more than likely be different sizes.

[64americandeluxe]

I hadn't thought of it that way.  That does make sense to me.  To be safe, I'll locate the part that is cross referenced in the Bulova catalog.

Thanks for your help.

Roger