yes this frog is ok. Unused condition. Please donīt damage it by putting it on a bayonet....
Maker 0/1001/0038 is Lederfabrik Fr. Vogel Mattighofen.
This maker also made the "M42" frog and tropical web frogs.
Given it is RB numbered it can only date from the period 1943 to 1945.
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Period was 1942 to 1945
EZGJ means Erzeugungsjahr = year of producing...
I'll have to check my notes, but I believe the EZGJ marking is for a Czech maker, and is also seen on pouches, slings, and holsters. With the link posted an interesting one, although the 1942 example was not pictured, and the link not helpful (to me at least) in pursuing the search for pictures or other data. Best Regards, Fred