[scooba]

Originally Posted by Haywood_Milton

“Three prestigious books?”

This is all kinds of wrong.

Come on, let’s see examples of the earliest case numbers, as that may provide primary evidence in contrast to recycled and unsupported claims.

With all the resources of membership and the internet, we still seem to be at 2,1m for the red 1680, don’t we?

As for the 18ct gold 1680/8, the German booklet is interesting if the date code is correct. However, booklets are commonly printed months before use and it might support the introduction of the gold version alone in early 1968.

215xxxxx 1.69 case back single red sub MK1 meters first . Hope this helps