May 17, 2012, 18:50
Lindell V. RiddleHi Tony,
You are taking on something interesting, here is part of what you need to know,
ANSWER ONE: Here is a good beginning topic...
"Hamilton 4992B 12 to 24 Hour Change Back" by Samie Smith
In that great topic Samie Smith, one of our experienced IHC185 Watchmakers provides a very informative tutorial on how to go about converting-back a 4992B movement from 12-hour to the original 24-hour configuration. Samie takes us step-by-step from a mechanical perspective.
As you see it is a bit more complicated than is commonly believed.
ANSWER TWO: Here is a topic where I tell about a 4992B that I have often shared with those in attendance at various political and patriotic events...
Click for: 4992B AT VETERANS DAY RECOGNITION 2005
Not all bezels will fit the back, you may have to try more than one and even get into some "thread-chasing" to make this happen. Used parts are floating around, we can likely find what you need.
ANSWER THREE: The folks at "International Dial" did factory authorized reconditioning for Hamilton all those many years ago and as I understand it they have the original dies and expertise to "re-do" a metal dial to the original 24-hour configuration today. For crystals on a "carry-watch" my recommendation would be plastic, there are too many risks with glass particularly on the movement side.
ANSWER FOUR: I would not recommend considering the use of a Sterling Silver case in this project as they are not only difficult to find but expensive. Furthermore after sixty years they probably should not be subjected to the wear and tear of daily use and all that such activity entails.
See what you think, let us know of any additional information that might be of help.
These are my views, let's hear what others say!
Lindell
