Unfortunately the Post Office "added a few white lines" to your photograph.
Darwin, personally, I think that's all "part of the game", receiving most of the postcards with some "signs of use". Although in some cases, it can be pretty bad. I do have a few spare prints; if you want, I can send you a new one in an envelope. Let me know.
Anyway; glad you (and others) like it; a common sense of humour reveals itself.
-- A sinister little midget with a bucket and a mop / Where the blood goes down the drain --