FYI, 2 VERY good associations are alca AND wclca,they have great info on some of these and a lot of other locks. This is from a WCLCA issue that is quite informative. The yearly dues are very reasonable too,for both assoc.

tried to scan page,but it would not upload, Maybe you can zoom these up to read.
It says no info on the F crown . this was 2016 issue
hope this helps