At least he didn't fib to ya.
Swinger appears to be stock.
It appears that he has moved the front brake drum to the rear, then laced to the drum. The TW front drum provides a much better rear brake than stock.
Front end is indeed early RM. But the drum is much bigger than my RM80's front end. Possibly 125?
Nice score. I'd rock it as-is. looks like you've got the stock rear rim if you ever want to go back.