35 D 5 on the headstock and 35 D 9 on the seat pole casting. Many times those are mistaken for frame numbers, so there is many Scouts registred with that as a frame number.
DGP 4317 is allegedly the last engine for 1928, so 5013 is the 695th item on the line in 1929 of maybe 5000 produced that year, so that ought be quite quite early in the season.