Here is my rad hewer, it's without the rad triangle proofmark. I think you see that less frequently as the ones with the rad proofmark. Must be manufactured in 1936 or 1934, in both years they were periods wen they produced them without it.
HÖLLER was one of the few certain manufacturers (I do remember also e.g. WKC and PUMA) who mostly (always?) did produce their RAD hewers without the RAD triangle. I don´t think it is year related. Regards,
"Never look for sqare eggs" as a late owner of an original FHH-dagger used to say.