This is a West German made darkroom timer, ideal for processing films or prints. It is in excellent working condition and I checked it against my computer clock. It is within 1 second over a 1 minute span, and within 2-3 seconds over a 5 minute span. It is a wind-up timer and has a +/- adjustment on the back. The 3 buttons on the top are for start, stop and reset. Has a few rust spots. It is about 5" tall.
A useful and fun thing to have.
$20 plus postage. Paypal.