Originally Posted by
Roger Payne
Can you either take another photo with the range drum markings completely visible, or, turn the range drum, & if there are only two 'clicks' between each range setting (eg between 200 & 300 yds & between 500 & 600 yds) then you have a Mk1. If there are a number of clicks, which increase as you go up the range scale (with increasing distance), then you have a Mk2.
There are also intermediate (50 yd) range markings on the Mk2 drum, but only every 100 yds on the Mk1 (this supposes the drum is original, of course).
Hope this helps.