To the best of my knowledge:
Pre 82 saw all bikes with half width hubs and 6" brakes,
Pre 72 there was a pressure relief valve for the return oil. ID;d by
a large 'nut' just under the bottom end of the rocker oil line.
The Pressed flat sided guards typify all bikes from the mid 60's
through to the mid 70's
Your REI numbers are early/mid 60's the EI numbers were applied to
CKD from the UK, but they were all 50's bikes.
Pre 62 bikes had mag dynos. (all the ckd's ex UK)

Tim
N.Z.

--- In royalenfield@yahoogroups.com, "victortrry" <feelixthecat@...>
wrote:
>
> Recently I bought a bullet. Now this one is quite different from
all
> the photos I have seen on this site. The front mudguard has
raised
> sides at the front, Ipresume this where a number plate was painted
on.
> The speedo is driven off the back wheel.
> The frame and engine numbers are the same being B107916 2C
> EI 69916 or E 1 69916. Onthe engine block below the breather is
another
> number being 41801.
> Would anyone have any idea what year model this would be, I don't
have
> previous registration papers but I believe it was a club
registered
> bike in Tasmania.
>
> Victor
>