Ernie,
I'm afraid I gave you all I know about P. Kleszewski. He was active in Metz before 1918 (I have his Drilling from this period) and seemingly emigrated to Möhringen after the French reclaimed Metz in 1918/19. I could not find anything on him in published sources. A research of archive material in France and Germany would probably give some results but would take a lot of determination.
- Jani