Allen-thanks for posting-it may be too late for someone. There was one that sure looked like it for sale at the Baltimore Antique Arms show this year, but it looked old to me, maybe it was I don't know, but I didn't buy it, someone else did. It is kind of a coincidence-I haven't seen a lock like that for sale in about 15 years and around the same time as someone starts reproducing them, one shows up at a gun show.
I guess you could call this item a "Nock off?"