The P08 frame version was introduced at the end of 1972, so we describe it as the 06/73
Mauser had problems getting different barrel lenghts to function properly in the beginning, so they tended to focus on the barrel lenghts that did work. The 6" barrels gave less problems.
There are actually 3 frame variations:
Variation 1: 29/70, Swiss style with Swiss opening curve.
Variation 2: 29/70, Swiss style with curve moved slightly to the rear.
Variation 3: 06/73, P08 style with same curve as variation 2.
(the opening curve is the shape of the toggle ramps or 'frame ears').
Here is one that never went to the USA. A 9mm Interarms contract that was made in 1972, proofed in Ulm in 1979 for sale on the European market. It ended up spending its entire life in the box. Curiously, the box also contained Sam Cummings' business card.