Found this with blade in cracked and rusted condition; bought it for the brass back. When I received it I found that what I thought was a fairly mundane handle from the photos was actually arrised. No screw through the handle into the brass back ;SJ talk of this new handling technique in their 1915 catalogue. There is no room left on the brass for any more script; Reuben Waxman was a tool dealer in Hanbury St Spitalfields; a suburb of London. BSSM has the script Extra Cast Steel as 1910 and this seems to fit. I have seen a photo of an open handled Mermaid with the extra screw in the back. I had this piece of .020 I received from Ron Bontz some years ago; I have a new Pferd Triangular needle pfile which I will test on the 20tpi. Tony