Anyone Know the Model Year of this Tamiya BMW R57/5 Motorcycle Kit?

Read the Wikipedia article. The Tamiya kit is of a 'toaster tank' /5 ('Slash 5') model, with the big chrome panels on the sides, introduced in 1972. There was the late /5 production of a 'LWB' (long wheelbase) model with the drive shaft housing shown in one of the Wiki photos. Finally, the /6 was introduced for 1974. So the kit is a '72, or '73 SWB, or '73=BD LWB model. Not that anyone but a /5 fanatic could tell the difference among them.

-- C.R. Krieger '78 R100RS

As an addendum, the Tamiya R75/5 Police version has a tank that appears to be correct for the '70 and '71 R75/5. So, if you are building one for somebody with one of the earlier bikes, you may need to look for a 'parts kit' for the tank.

Good luck. I can tell you a lot more about the various smaller scale R100s ...

-- C.R. Krieger '78 R100RS

those are ok, but i'll hang on to that r69s. just need to paint the summabitch. maybe hot pink to give the beemer snots heart failure. hmmm, i could chop it....

or look in walneck's classic cycle trader for one of the 100's of parts places. could be a lot cheaper.