I recently accqried an H&R Model 922 as follows: 6" Octagonal barrel, brass half-moon front sight, pull-pin cylinder,serial# 158xxx. Left top flat says ' H&R Arms Company Worcester, Mass, USA (2 lines) Left flat has H & R 922 There are no caliber markings. It as a nine shot solid frame SA/DA with Bisley style grips, apparently over-sized wrap around w/ 1 screw. Would it be possible for someone to give me an approximate date of manufacture? I have access to the BB for an approximate value.