Wow. They butchered the back base, which is a Unertl Posas type. Too many sights to mention here but the standard was the M82-A flip sight rear, and the M93 front sight. Several options were available. My # 4419 (1925) has a M82-A rear and a late M17, not M17-A, front. One of the early Lyman 48's that slide into the receiver would be correct too. These are scarce. This is # 4419 with a 1925 vintage Cleveland address Fecker # 1182.
Big Larry

