I have added this note to the database thread in the gallery:

https://forum.vintageairgunsgallery....ase/#post-2372

Note: I am no longer updating this database so if your Falke 80 or 90 is not listed, you don't need to have it included. The reason is that I have lost confidence that it was a rigorous numbering system; instead I think it was primarily a way to ensure the loading taps and breech housings were kept unique to one rifle after the two parts were individually honed so as to match each other perfectly - ie. in order to form an airtight seal. The number of duplicate and triplicates uncovered supports this hypothesis.

I still believe the numbers made were very roughly in the generally understood ballpark of 400 model 80s and 200 model 90s. See also this thread if you're interested:

https://forum.vintageairgunsgallery....ver-numbering/

Lots more info if you're a complete Falke nerd like me:

https://forum.vintageairgunsgallery....lke-resources/
https://forum.vintageairgunsgallery.com/falke-airguns/