This is an excellent Omega 1/10,000th hour timer from the 1960s.
 
It takes 36 seconds for the hand to sweep one complete rotation of the dial. 36 seconds is equal to 1/100th of an hour. The dial consists of 100 indexes so each index represents 1/10,000th of an hour. So this industrial timer would have been used to measure processes in 10,000ths of an hour rather than seconds or minutes and seconds.
 
The small secondary dial can record cumulatively up to 0.3 of an hour which equals 18 minutes.
 
Slide the slider clockwise to commence timing. Slide it back to stop timing. Slide it clockwise again to recommence timing from where you left off and slide it back to stop. Depress the crown to reset to zero.
 
The condition is almost new.
 
The dial and everything about the dial is in almost perfect condition. The white hasn't discoulered and the black print remains fully saturated. There is a small scratch between .10 and .15 on the sub dial but this is hard to se. Fabulous blue steel hands. Very slight scratches on the plexiglass. It is signed Omega. 
 
The case only has  micro scratches. There is a blank sticker on the case back. Beautiful crown with "as new" sharp detailing. The crown and pusher work as they should. Opening the back takes you to a dust cover. Removing this reveals the beautifully engineered Omega calibre 5640. It's fully marked with Omega, Swiss, 7 jewels, the Omega logo, calibre number and serial number. Spotless inside and runs as it should.
 
A rare high speed timer.