Hi,
Well, the numbering on postwar Mausers certainly is interesting, as both the 29/70 as the 06/73 ran alongside for a while, causing much confusion in the numbering department. Even Mauser doesn't know where certain transitions were made.
My 1972-ish 06/73 has serial number 10.004187, stamped both on the receiver and the frame area. It has the new style frame and receiverand the old style safety and takedown lever. It also has the old style trigger. Therefore I tend to call it the '06/72-and-a-half'.
The 72-and-a-half came with the 1973-style booklet.
Mauro: Do you have any information in Mauser's involvement in the reworks of vintage P08s? I've come to understand that the so-called Frankonia reworks may have been restored by Mauser. Haven't found any substantial proof of this, besides the picture of a vintage reworked P08 in a Mauser catalog. My Frankonia rework came boxed with a Mauser manual...