Hello, I don t have my RRPP daggers at hands for measurements but what I can see from the pics, due to a lot of features, it is an original RRPP dagger crossguard. Personally I doubt that you can distinguish if it is an EICKHORN or HOERSTER crossguard as these two firms did exchange parts.
Regards,
I did a comparison a few years ago, below are a few crossguards measured at the time...
Best, Gary
thank you very much for your help , highly appreciated