On the Rekord release, the A side is Rare Essence (featuring Reg. Boyd Jr.) which is basically the band track with the girl backing singers. The B side is David Martin with backing vocals by The Rare Essence. Is it the same case with the Jaypee release?
I would imagine you would get 70% max of the dealer's notion of it's price, or have you pay them 10% or more in commision for them auctioning it for you.
If it's something on my wants list, it's worth £5 - £10!