THIS IS AN OMEGA 21 JEWEL 5 POSITIONS POCKET WATCH MOVEMENT. IT'S A SIZE 16S, IT'S 42MM IN DIAMETER. SOLD AS IS, USE FOR PARTS. THE SERIAL NUMBER IS 5126725. THE DIAL SAYS EVERTS RUBY JEWELED, THE BALANCE WHEEL IS INTACT BUT CAME UNATTACHED. IT'S UNTESTED AND THE STEM AND CROWN ARE NOT INCLUDED.