Ok, sorry that I don't keep up on every thread here or every other forum to understand the backstory of new posts.
Going just on what is said in this thread, someone who 'is very used to this model' would know that it has an automatic frame counter. I'll assume some sort of miscommunication between the repairman and the OP, or by the OP here.
Anyway, re using the frame counter numbers in the 'window': the number spacing, small amount of counter dial movement per frame, and the number design don't offer a consistent marker point to get even frame spacing on this camera using the 'window' as a winding indicator. Most likely overlap would occur at some point(s) in the roll.
There are a few possible causes of the frame counter not stopping in a Rolleicord Vb (Va has the same system). I do have knowledge of this but I bet you can find it discussed in a post sometime in the last fifteen years so I won't clog up the forum.
