I have a similar Radom with K9XXX serial number and features as yours, no stock slot with takedown latch, lanyard ring WaA77 german acceptance marks. Have the Robert Berger book on the Radom pistol but there is not much information on them. I was told on another forum the K block I have was made in 1943. Yours is probably from the same year, those made in 1941 would have the earlier Polish features (stock slot) I don't know about Radom value but WWII stuff keeps going up, I would sell the more common firearms before the wartime ones go.
Did some more digging a G block should put the date at 1942, Germans did not get going on making Radoms for almost a year and used up the left over polish parts first