W Castleton razor

Hi all, I am in search of some info on W Castleton razors. I have just bought what appears to be a 5/8 or 6/8 (hard to tell and the listing doesn't say what it is so I'll have to wait until it gets here) but a search is turning up a blank.

I am hoping the encylopidic minds here might have some info :)

Here is the razor in question. To tell you the truth I wish I didn't win it, I'm not sure what was going through my mind when I bid on it ! Still I'm a man of my word and a bid is a bid so I own it now and it would be nice to know what it is I've bought lol

Vintage W Castleton Cut Throat Straight Razor | eBay