When were unfluted firing pins modified / replaced ?

[Stu]

Originally Posted by Doubs

According to Gortz & Sturgess, the Reichswehr directed on 17 September, 1930, that the firing pins of all Lugers in inventory were to be modified with flutes by unit armorers. The work was to be completed by 30 September, 1931. All new Lugers purchased after 1930 were to have the fluted firing pins. Chapter 17, page 1116.

Very interesting. I'm intrigued why both of my 1920 marked guns still have unfluted pins, (numbers do match). I assume they weren't in inventory by 1930 ? They're both in reasonable condition and don't have any 'GERMANY', or other marks, indicative of being sold for export.