I only have the one JzPf but have additional JzPf service souvenirs. I do have an HR17 stein, I’ve had it for years, but it’s in need of restoration, I just never got around to it.
I agree with Jeff, there should be white enamel behind the “SUUM CUIQUE” with the addition of the reserve cross, but this plate has no indication that it ever had one. Also the plate looks to be off center on the helmet?