Just got this 992B sig.3 a few days ago wound her up and it ran for 61 hrs.Didn't beleive it.Wound her again.Off she went with the same results.Did lose about amin.Is this possible? Regards Roger

Hi Roger,

They run for between 50 and 56 hours on the avarage. That is the first one I have heard of that ran for that long. It really doesn't suprise me though.

Regards,
Larry

Thanks Larry,I have had them to go 50 plus.I am running it again.

That's a long runner Roger. 40-50 hours is more typical for 992B's in my experience.

Ed that seems to be right.I am checking it again so will see.

Roger,

There are two different length springs for the 992B. The longer one is 29.5 inches and rated for about 54 hours. Like Larry I’m not surprised it ran that long. Maybe it has something to do with the availability of synthetic oils. What is interesting is that it only lost a minute after all those hours. When I was carrying a 992B daily it was regulated slightly fast and when it needed to be adjusted I would wind it every other day until it was on time. The ability of the 992B to run for well over 48 hours is one of the things that make it such a great watch.

RR

Thanks for your input Richard.Right now is 25hrs.15min.dead on.

Now is 48hrs.about 30seconds off.

Roger,

From what you are reporting it would appear that if your 992B was wound at the same time every day, which of course was always the recommendation, it would likely never vary.

Your "25hrs.15min.dead on" is what it was designed to do.

Don

I agree Donald but I only wound it on day one.Has not been wound other than that.Want to see how long it runs on one wind.

Wound and set@8:15pm 11/1/12 stopped 9:21am 11/4/12 lost 2mins. 60hrs or so. Someone check my math.

Now that you've run the mainspring all the way, try setting and winding it at noon today, then wind it each day around noon and see where it is at the end of seven days. Keep it in the "pendant up" position all that time, what I describe was the accepted test of timekeeping abilities before the advent of timing machines. Time inspectors had cup hooks on their walls for timing watches. To be approved for Railroad Time Service watches had to demonstrate performance within 30 seconds, plus or minus at the end of the test period.

From there watches were regulated to the user as necessary.

Don

Just a question from a non-watch maker type collector....would an Illinois type 60 hour mainspring fit in a 992B?

Regards! Mark

I have seen a 992 before that could also do this. I suspect some Hamilton experimented after the 60 hour Bunn Special.

Donald 12 o'clock won't work for me but 4:30 will.Watch set and wound .Will let you know results tomorrow.Perhaps as Mark suggested Hamilton did experiment with a sixty hour mainspring

Watch checked and dead on.

Roger, I have a customer, a member, in Canada that has a 992B from me that he has not touched in over two months. He winds it every morning at seven. It is hanging on a shoe string!

I work on 992B's almost every day, and I have to tell you, it is nothing to see them run for 54 hours or more.

Regards,
Larry

I just finish testing my 999B it run for 55 hours
and 21 minutes and I have no clue of last COA.

Simply amazing!Love these relics of the past!!!

Mark,

I think the 60 hour spring would probably fit into the 992B barrel but the watch wouldn’t run as long because the Illinois spring is only 27 inches long. The Illinois sixty hour watches are geared different to get the longer run time.

RR