Imman Meffert "System Klobe"?

[C. Stockwells]

I also posted on Gunboards, but I registered on here to see if anyone has any information regarding "System Klobe" (or Kolbe?) Imman Meffert schutzen rifles? Production years, Suhl-specific proof marks? Were these nitro proofed?

Here is an example from 2017:

https://www.rockislandauction.com/detail/71/1081/engraved-immanuel-meffert-system-klobe-schuetzen-rifle

Thanks in advance!