What is interesting though is the unmentioned American made Paul Hunter eprom/battery backed ram board shown as the main picture in the listing (does the seller think this is the blower)?.
They can be configured for either ram(2116) or eprom (2716/2732) or both combined, this one has the battery cell holder but not the read/write switch fitted.
They were vary desirable at the time and I used to use mine loaded with a tool kit some speech for My sweet talker and the rom from Memotechs z80 assembler on board until Charlie made it redundant with His damn zxpand
Anyhow should anyone want to bid on this and win it I have full instruction/construction manual for it listing the various configurations of the board plus some sample programs, that I am more than happy to share.
I would add I have nothing to do with this auction in any way , just thought it worth mentioning.
http://www.ebay.co.uk/itm/ZX81-EPROM-Bl ... 233831b4c0
EDIT Just noticed the 8255 chip on one of the cards as used by Eprom Services as the interface between the z80 and the eprom being programmed , so there may be a blower amongst this lot somewhere but certainly not the Hunter board in the main picture.