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.