Would the KG 254 refer to Kampfgeschwader 254 formed in 1937?
First geschwader,Kampgeschwader 254,,,maker is "Friedrich Keller,Oberstein"
Great rig! Looks like the belt's buckle catch displays the early R.S.S. logo if my memory serves me correctly. Great X-mas present for sure! Sorry I can't help you with the markings. Congrats!
Nice little set, unit marked belt, and as Rob stated the catch is marked with the early R Seiper marking and a nice buckle by Keller
i also have 2 buckles by r.seiper.
i will post them when i am able.