Very nice, clean. Could be an historical oddity, or a restoration.
The front turn signals would've normally been mounted to chrome brackets off the fork caps. But, there was the other fork ear stalk mount that came out somewhere in '72, but my parts lists are too fuzzy to nail that down.
That type of taillight would've normally been an XS1 item, changing to the round type in '71, but the parts lists show that XS1 style taillight continuing on to '72.
And, as Cra-Z1 noted, the handlebar switch should be black.
Otherwise, the only '71 XS1B stuff I can see is the color...