Is this John Lennon or isn't it?

This picture said to be from 1980 and taken in Greenwich Village at Halloween, isn't actually confirmed to be John Lennon, but comments on Facebook (where I saw it first), for what it's worth, seem to think it's him. There's also a color version (see below). (It was printed in a BBC article in 2005 and identified as him.)

Update: Someone on the Hoffman board found a picture of John and Yoko out on bicycles. And the bike John is sitting on resembles the one in the picture above.