Hi Brant,
@New Mexico Brant
I think D38310P indicates a 1913 Pope built bicycle. My reasoning is at post 11 here:
https://thecabe.com/forum/threads/odd-duck-chinook-from-portland-or.163149/page-2
I was considering
@redline1968 's bike E14618P at the time.
View attachment 1786748
Incidentally, since it's a British motor (a product of Rover), I'm guessing the registration number SU334 is also british (I hope you have the V5 registration document if so, since this has a value in itself).
SU was originally a scottish number, from Kincardineshire, and issued at first from Jan 1904 to 1 August 1961, when the UK registration system changed.
At some point in the late 1970's, the licensing authority in the UK started to issue 'Age related numbers', or appropriate registrations to verifably old vehicles that had lost their registration, or been imported. Since Kincardineshire was one of the least used series, their were lots of spare numbers, so the series was continued again through the 1980's until it ran out.
Best Regards,
Adrian