In 2000 I had the privelige to tour the Suhl Proof House with the members of the German Gun Collectors association. The following pictures were taken at that time.

Waiting in front of the Proof House are left to right- Jock Lamont, Rob Blank, Augie Testa, Hans Pfingsten and John Neumann.
The main examining room where guns are measured, examined and after test firing stamped with the proof marks. Left to right are- Proof House employee with his back to the camera, Jock Lamont, Augie Testa, The late Dietrich Apel, Rob Blank and the late Hans Pfingsten.
A set of barrels being stamped with the proof marks after testing
A side by side gun being test fired in the safe room.