Let me third that-- it IS a LWB. My LWB R60/5 has a production date of 7/73 and it was a late /5 (end of /5 production was like Sept '73).
And the mileage is probably 20K-- those (never-lubed) drive splines are minimally worn. Look at the brake pedal-- the wear on the diamond pattern is also a good wear indicator.
New pipes and /6 muffs. I'd guess that it's just sat outside a lot.
Shocks look pretty rough. I have a pair of old ones from mine that look good and work OK. Yours for the shipping-- PM me.
'73 R60/5 Toaster