Who built this Rolls Royce Motobike??

[Archie Sturmer]

Nice bike. It seems like many or most of the Emblem chain ring sprockets look like those of other bicycle manufacturers; but many or most Emblems that I have seen have a some what unique wide 2” offset drive pin, and oversized threads on the shaft and bearing cones.
I was thinking early 1930’s, with the high serial number; is it also a shorter frame?

 

[bentwoody66]

Edward's and Christ was a jobbers, they carried a plethora of top brands.

 

[SKPC]

Nice Emblem Brant! mid-30's with typically seen Emblem parts. Looks also to have 2" drive pin spacing on crank. Truss rods, headset top race, Trumpets, fenders. 28-er DJ steel clinchers look original!? Below is my Emblem/Pierce frame with Pierce dropouts...(not stamped) that is earlier. Emblem made many different moto frames and forks.

And an example like yours Brant from my Emblem pic file.