It's sort of a stylized version of his signature that Yoko has put on Lennon products. This comes from lithographs that were released in 1988...
I wouldn't buy ANYTHING from this auction house: Special Auction Services. TONS of Beatles and other fakes -- plus who knows -- the supposed "real ones" might be photocopies.
Stay far away -- they certainly know their stuff is fake.
So!! who Police's these crooked Auction Houses? I have seen plenty of them named on this site.
Well done and good work.