First bit is easy as it is the Peck coin which had been languishing in the dungeon since the Noble sale in 1973 - see below.
It was listed on eBay within a couple days of the Baldwin sale in May 2006 as a BIN for £800, he having paid £360 hammer for it. I finally bought it in August. It came from a seller that always had bids on his coins (including this one) from a couple of dodgy bidders (tee2459 & matthews9289) with a combined feedback of 1. It transpired that he lived three miles up the road. Small world.