Here is a Kalimar model OM-1 autowinder. I used this once on the OM-1 I had and it was fine. It may work on other OM models...I never tried it. Takes 4 AA batteries. Battery contacts are clean with no corrosion and overall unit shows little wear. One mark on bottom looks like it could have come from a tripod (not bad) and that's really about all I see.
$30 plus actual postage.
PayPal ok for international, checks/cash/money order for USA please.
I've been asked if the autowinder will work on models other than the OM-1, and that is a very good question. I tried it on the OM-10 and it works like a champ. Actually it makes a neat sound that is very similar to a commonly used Foley Room (or maybe more formally called a Foley Studio) camera shutter sound. What's a Foley Room? Well, in making movies or tv programs sound effects are essential. The Foley Room is where sound effects are created, kept and used. A Foley artist might use something like this for a camera sound: http://www.youtube.com/watch?v=Xvc5jh5-fCM
Jon