This is a very nice example but I really don't know much about it. Probably covers 4x5 but this is just a guess. Uncoated glass shows some oxidation often referred to as "natural coating"... see pics. No retaining ring.

I think I have brand new caps to fit this lens and will include with the purchase.

White specs caused by image upload.

Entertaining offers!!

Postal money order or money gram only.