That would have had to be signed by Freddie in the absolute biggest rush of his life to have been genuine. It's certainly possible, but I wouldnt touch it with a ten foot pole. The Brian looks great. Roger isn't nice but could be rushed. The freddie is my real concern. Too much of a gamble imo.
There are rare deals that pop up from time to time but $700 for a fully signed genuine Queen item? The seller has to know the item is questionable for it to be let go for that much. You're not going to find a fully signed genuine piece for less than a few thousand today.