I've seen it on a number of Beatles sites; I'm pretty sure it is real, even if the 325 looks like it has slightly different lighting/exposure. It may be Astrid being artsy with the lighting (assuming she took this picture.) EDIT: didn't see above post.
It's one of Astrid's I believe, when she was the band's photographer of sorts in Hamburg. If it's not her's, it definitely has her style with the usage of the shadows.
Sarcasm just doesn't come through when you're typing...
Actually it was taken by Jurgen Vollmer. This and many others are featured in his book "ROCK 'N' ROLL TIMES". Vollmer also took the picture of Lennon featured on the front cover of his 'Rock 'N' Roll' album.