Wolfgang, the latest Kriegsmarine kits observed by me are those of 1939, but I do not rule out the possible existence of later kits.
I think it's a good idea to summarize all the KM Rg34's observed here.
Other KM marked/accepted stuff shows up till 1943.
I have a maker marked and 1944 dated bayonet frog which is also Eagle over M stamped. There are pics of it in the reference section.
And have seen the "double circle" marking on a 1941 dated bayonet frog so there must have been some overlap in the use of both styles.
I know of another HAWIG over here. Almost exactly like the one I showed here earlier, but with different N.xxx number.