There is an ad in the Cafe classified right now, someone looking to trade a Gibson F9 for an OME "F5 style".
I'm not aware of such an animal. I have seen and played a couple of ODE A models (with f holes) and understand they were made by Givens.
I'd appreciate knowing more about OME mandolins. What years were they made, who made them, how rare are they, current value, etc.
ODE/OME is pretty well known in the banjo world. ODE was the company/brand name before it was sold to Baldwin and thereafter Gretsch. Chuck Ogsbury, the owner of ODE, started up OME after his non-compete agreement expired.