PF, The lighting on the charger bridge caused what you see, there's a small rectangle of casting a wee bit proud towards the front. The backsight is original. The Mk.II backsight was one of the first war expediant parts put into production, my '41 Maltby also had one (swapped to Mk.I), not too common, but there are others.

This BSA-Shirley was converted by Santa Fe Arms in the very early '60s and I'm the third generation family owner. It was what planted the evil L-E seed!

Brad
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