Nah, seanbarney is right, the pan isn't quite right for a Corbin Gentry, which is what I was thinking of. The seat I have is at my storage space so I won't be able to get at it until later in the weekend, but here's what their pans look like in general:

The seat I have also has the welded on hinge tabs like this one, so it's not the same as yours.
Looking more closely at your picture, what's with the cracking around the latch holes? Is that fiberglass? Perhaps some PO's attempt to cover up the old holes?
mystic_1
EDIT: whole pan looks like fiberglass to me, now that I look even closer
