The range and deflection drums (thread 50) were the principal problem Rob. There were no identifiable markings and such as the 'clicks' were, they didn't equate to anything as I remember from the paperwork we had. I have one in front of me now (4430-S) and 'UP 20' doesn't relate to 20 MoA or 20 anything that I can establish on the range and azimuth chart. Nor does R-10 or R-30 on the deflection drum either. And while I'm here.............. where is the datum mark from which the hapless sniper sets his range - or indeed, starts his clicks if need be? No wonder we issued the fledgling European Army snipers with No4T's/No32's when they came to Hythe in the 40's and 50's on their courses.
It might have been a good rifle telescope Rob, but that doesn't make it a good SNIPERS telescope