it's a '77 125B
nice example especially as it was a ride bike
only change I'd make just looking at it would be fit the original size tank stickers, whack on a decent size ally rear sprocket and put the extra clamps and rubber isolation blocks back on the remote reservoirs
might have to take a look at the sprocket cover too as it appears the rear mount screw is not there which is quite typical after the 1st chain derailment
nice bike tho...