The No. 121 in those David Trevelion pictures is the Frank J. Barthmaier (one of the original directors of the A.H. Fox Gun Co.) gun from the first year of the A.H. Fox Gun Co. BoWhoop II is Burt Becker serial number 121. Two totally different guns. I have no idea why Drew has those pictures in a picture thread on Nash Buckingham and the BoWhoops?