Possibly I need to review the patent associated with the trademark Herold as I thought it was connected to the exterior lugs/lumps:


L. Ernst Evertz of Duren retailed sporting arm.






Interesting tube maker's stamp or Birmingham proof Crown over BV?

http://www.gunbroker.com/Auction/ViewItem.aspx?Item=290357285

Kind Regards,

Raimey
rse