I realised that I have a couple of chisels which while not as long as Jim's find are just about as heavily built. Both have the maker's mark on the "top" ie the same side as the bevel (call it front or back, I don't mind.)
This one is from Woodcock of Sheffield:
while this one is from JH Swift and Sons:
I also found a great picture of the Swift works - redolent of simpler times, I thought - I won't post it as the library site forbids image posting, but follow this link - I suspect there are many more good tool-related photos there:
http://www.picturesheffield.com/fro..._No_increment;EQUALS;s18670&pos=2&action=zoom
This one is from Woodcock of Sheffield:
while this one is from JH Swift and Sons:
I also found a great picture of the Swift works - redolent of simpler times, I thought - I won't post it as the library site forbids image posting, but follow this link - I suspect there are many more good tool-related photos there:
http://www.picturesheffield.com/fro..._No_increment;EQUALS;s18670&pos=2&action=zoom