This is a very nice example of a sports timer single hand pocket nail-set pocket watch  .It is running very well ,it has a 45 minute timer and the watch can be stopped via the button at the 2 o clock position. it has a patent date of 1910 but I assume this is a bit later  to around 1950-60 ,it has a nice clean & is ticking away nicely running great  (but not serviced)  d, it sets winds and runs perfectly keeping excellent time as mentioned (sets by pushing the pin in at 11 o clock poistion , not pulling the crown N.B.) .I have many to sell that were bequeathed to me ,so please keep watching my auctions , collection or viewing is maybe possible before purchase with prior arrangement .This is a lovely looking watch in very nice vintage condition with clean movement , case has stamps as pictured