This recently ended on eBay.....
touted as a letter opener, a plug bayonet with what appears to be some age....however a quick google search revealed that this was a reproduction sold by various sources. I am not saying the seller was necessarily aware that this was a repro but the artifically aged look was probably deliberate and could mean more may found their way onto the market....
http://www.ebay.co.uk/itm/1208634099...84.m1438.l2649
PS although the item did not sell via ebay......the listing was ended as it was no longer available....usually this means it sold 'outside' ebay....I do hope a fellow formite has not ended up with this.
Kind Regards David
Pictures added for reference....the 'clean' example is obviously a 'new' one.