Unit Mark ?
 

Looks like the stamps on this reichsrevolver luger conversion are: 40.R and 1910. What do you think?

And if indeed 40.R., would this be the 40th reserve of the 28th reserve Infantry Division, or the 40th Infantry Regimient (Hohenzollern) Fusiliers "Prince Charles Anton of Hohenzollern" of the 28th Infantry Division.

I am not sure what else it could be.

Hi Joe,
I can't make out any detail in your photos, please try to take them again with different lighting.
Norm

The date is definitely 1910. The other stamp is not as clear:

?0. R

The first number is the one that is hard to make out. By its shape, it appears to most closely resemble a 4 that has faded in part. I thought maybe a 1, but it does not match the 1 in the date.

Infantry Regiment 40.

These stamps on the leather were made by the Bekleidungsämter (clothing depots). Reserve Infanterie Regiment would be RJR or RIR on holsters.

It must be 40th Infantry Regimient (Hohenzollern) Fusiliers "Prince Charles Anton of Hohenzollern" of the 28th Infantry Division.

Thanks to George and Klaus.