I picked this up today . Pity its gold filled . But cool .Lever Set .A Early Dual Split Chronograph . Only markings on the movement is PAT FEB 14 88 .And has Pat. Dec 7 8?. Maybe 88 or 82 on Case Edge . Looks like a better quality Swiss Movement . Seems to run great. Any help with functions would be helpful . Not sure what does what . Really nice save for the scratches on crystal . Thanks

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4 . The quality of the movement looks much better than my pics .

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The two sweep second hands almost certainly mean that your watch is a split second chronograph. I am traveling, but I recall that my split second chronographs work like this, starting with both second hands pointing to 12. Depress the crown and they both starting timing seconds together. Depress the push button at 11 and one hand stops while the other continues. Depress that button again and the stopped hand catches up with the moving hand. Depress it again and one hand stops again, while the other continues moving, etc. Depress the crown and both hands stop. Depress the crown and both hands and the register reset to zero.

As for the maker, among American makers (ignoring artisans like Albert Potter), I believe that only Waltham made repeaters or split second chronographs. Your movement almost certainly is Swiss, but it doesn't resemble any with which I am familiar.

Thanks mucho . I finally figured out it must be a split chrono .........

Nice one Mike I wish I could find one like yours.

Hmm, this looks like it has many characteristics of your movement
Patented Feb 14, 1888

This split second chronograph appears to have a disengaged minute wheel lock spring. When that is re-engaged to the accumulated minute wheel it should again hold advances in accumulated minutes. Chris Abell specializes in these beauties.

Many of these were assembled from subassemblies made by many different specialty shops. So only a real "expert" could tell who claimed to be the "maker".

As usual , thanks .

Dave
The spring looks correct, it will hook onto a stud below the hammer, and supplies the power to swing the hammers over to reset sweep and minute hands. I need a good photo editor so that I can add arrows and comments . At the point of the box you can just make out the pin that advances the minute wheel