Posted something similar a year or so ago. I believe the RZM marking with motto only to be the rarest form of standard HJ. I have 24 of these with 20 different makers and two unmarked.
Numbers I have are 2, 5, 8, 13, 14, 27, 33, 36, 38, 43, 46, 49, 51, 60, 66, 72, 102, 109. got an early no ricasso m7/2 from Huston and it is the only no ricasso RZM only I have ever seen with motto. The m7/51 configuration is the one most often seen. What have you got? Russ