Don't what the description states other than no provenance but, at least, someone hasn't tried to pass it off as authentic. Not even "hand signed", imo.
I agree the signatures do not look like they are hand signed nor does it look like live ink especially on a glossy photo. I differ with the auction house starting bid of £600 with an estimate of £1000 to £1500!!!
Surely an auction house can tell live ink vs printed signatures and no one is going to start the bidding at £600 for a preprinted photo.