I'm with you Rasputin, I like them and am keeping them on the bike, assuming they aren't rotted out inside. They remind me somewhat of the original mufflers on my BMW R75. I even have another set from a 75 to try on "Dad's bike" someday.
I also checked the date codes on the tires for grins. They are Yokohama's, the front is a Y-982 dated 313, 31st week of 1973 (presumably not 1983) and the rear is a Y-981 dated 393 so 39th week of 1973. The steering head sticker says it was manufactured 11/73 so sure seems like those are the original tires.
I just got back from my first ride of the year on Dad's bike, started right up with a couple of kicks and ran good. It was low 70's and sunny today, March days like that are not to be wasted in NE Ohio.
I did notice the license plate is cracked about 1/3 of the way through so need to reinforce that.