Well, somebody's going to be very, very lucky, 'cause they're going to get something for way, way less than they might have paid otherwise.
I used to have many Kodak process lenses - you know, those ones with the weird FLs: 18 1/2", 19 3/4", 21 1/4". I used one marked 19 3/4" Ektanon, until I picked up a decent 19" RD Artar. I sold the Ektanon, but can't find any record of who bought it. I recently came across a brass adapter I made for that lens, so that I could use 77mm filters and lens shades on it. I have no use for this adapter, as I don't have any of those lenses anymore.
Kodak used the same barrel on several of their lenses, so I beleive this adapter will fit some of the other Kodak process lenses, but I can't be sure which ones. My memory is that it does not fit the 18 1/2's. I've had some of these lenses that were marked "Ektanon" and "Eastman Anastigmat" and were absolutely identical, so it might fit a non-Ektanon 19 3/4".
The Major Diameter (outside measurement of the male threads) of the adapter is 2.528". Get your calipers out and measure your lens. If it's a smidge over 2.5", you may be in luck.
If anyone thinks it may fit their lens and wants to take a chance, I'll be happy to refund their money if it doesn't work out. Buyer has to pay the postage both ways, though.
$25 + shipping. Paypal OK. USPS 1st Class postage, in a padded envelope, will probably be about $3.
Charley