This one is very good condition, though not mint as the seller claims. It has a broken zip pull and wear to the cuffs, but still a nice example with the wartime owner being a Wing Commander, according to the seller. The start price is OTT. Although these CC jackets rarely sell for more than £550 with its provenance it might go for more, but perhaps not £800.
http://cgi.ebay.co.uk/ORIGINAL-IRVIN-WW ... 0289750421
http://cgi.ebay.co.uk/ORIGINAL-IRVIN-WW ... 0289750421