Michael,
There is material surfacing at the moment, but it doesn't help much in determining the exact dates of changes, but they do clearly illustrate the changes in material, heat treatment, reinforcement, etc...
Since the DWM/Mauser P08 has been made under the supervision of 1 man for about 32 years, there are lots of small 'running changes' and this, at least for the DWM and Mauser products helped formulating the phrase 'the younger the better'
