73 Trophy

Have a look at www.tri-corengland.com for the engine number dating system. I'm guessing that the P to which you refer relates to the month of manufacture (November) and not the year (1977).
Then again I could have misunderstood your dilemma (nowt new there then)!

 

Engine numbers are on the crankcase on the left hand side a P on the barrel has no real meaning. If its an ex Police bike the numbers on the crankcase will start with TR6P

 

Only 25 made for the 73 year

 

Any plans yet as to which way you are going with it.

 

Did the police spec bikes, at one time or another, get some form of rubber mounting for the engine? I'm sure I read it somewhere.

 

Here is a great way to improve that front brake http://www.tricor-andy.com/product/front-brake-cam-conical-hub-extra-long-pr/

 

A few bikes were made with rubber mounts just for evaluation but there is very little info on these bikes.

 

So did a little birdie tell me you are thinking about some new wheels ?

 

https://www.motorcycleproducts.co.uk/tyre-clamp-325-350-185-rubber-p-11226.html
https://www.motorcycleproducts.co.uk/tyre-clamp-350-400-215-rubber-p-11227.html
Dunlop do the the original K70 and K81's in 18 and 19" for triumphs

 

Either tyre would be ok for your bike, i use the K70's on my 69 T120 as they do a 400 18 rear and 325 19 front that were standard fit. As i ride my older bikes at a lot slower pace than my modern bike i find them more than adequate