Opinions on the sangamo special ,23 jewel..

A lot of people think these are suppose to run 60 plus hours, I found in the book from the factory that these should run between 48-55 hours, so I'd like your opinion on how long these are suppose to run, factory wise, not cobled up..thanks
Regards Paul

Well, I know that the Bunn Special you COA'd for me will run 48 hours when I forget to wind it.

Hi Paul,
This is just my take on the subject, in other words my opinion and experience. I don't put a lot of concern on how many hours I can get a watch to run for, and on top of that the watch is going to vary on running time in certain positions. What I do have a big concern for is how good the watch performs in a 24 hour period. Keeping the watch wound at the same time every day every 24 hours or as close as possible keeps the main spring in its peak performance range. I have noticed these watches drop off considerably in time keeping ability the last 12-8 hours of the main spring.
Saying all that I would be happy with 48-55 hours so it would not stop in case I forgot to wind it.
"Just my two cents worth"
Tim

I expect the '60' hour feature is just like a 2X4 which is 1 5/8 X 3 5/8 inches, nominal measure. Many years ago when I was using a Hampden 105 to run freight trains it was wound once a day as close to the same time as possible and it never varied out of railroad specs. A 48 hour run with the same performance would have been a bonus, for sure.

Hi Paul,

If you check out the IHC Illinois research forum,
https://ihc185.infopop.cc/eve/f...1029912/m/4231069691
you'll see that the 23j Sangamo Specials were produced with 60-hour mainsprings beginning in the mid 1920s. The earliest 60-hour movements, I believe, were not so marked on the movement, but the later ones were. Prior to that, they were standard 48-hour movements. For example, my ca. 1921 SS Model 10 that is pictured on my avatar came before the 60-hour movements were produced.

Great answer Michael !!

regards,
bb

Thank you very much Mike for the clarification, I couldnt find that in my books, ...

You can always tell quickly if it is 60hr or not by the balance cock- Early 48 Hour ones have the border on the balance cock- later 60 hour ones do not have a border- easy way to tell at a glance.

Terry Jones

In the link that Mike referenced, Lindell posted the following information...


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________Note: The 48-Hour Model 10 should stop by number 4167000_______

_____________________________________________________________

________Note: From this point Sangamo Special movements are 60-Hour_____

===================================================


...and looking at the images he posted you will find "Sixty Hour" spelled out.

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Thanks for the compliment, Buster. Coming from you that means an awful lot.

You're welcome, Paul. Illinois watches are one of my favorite to collect, and I've spent a ton of time researching them!

Dr. Debbie's terrific contributions need no further comment from me.