To the right (big) kid it could be worth a lot more - particularly if it can be ridden by adults. But I've never seen one before. There weren't many BSOs back in the 60s/70s and kids bikes as a whole were more expensive and so better built.
Bet you some hipsters on LFGSS would love to be riding around on that. Pretty sure there are some threads dedicated to small wheelers/old shoppers etc.