Nonpareil

I have no direct knowledge of that particular panel saw, but it looks awfully nice. I looked through a couple catalogs from the early 1900s (1915/1925). I didnt see your saw in either. FWIW, If I had to guess, Id say its a post-WWII.
I have these two Tyzack back saws. Both are of fantastic quality and contruction. These are later models. From what I understand, they were sold in the 70s/80s and were some of the best saws available at the time.

Tedstor if you add 100 years more to your saw you are closer to the age than saying 1970/80
after ww II they started to look closer to the most awful cheap plastic handle you see today

Royston
I don´t know much about dating age on saws but I have on of tyzaks 28 inch saws simular to yours
and I have been told that shuold be around 140-150 years old
yours look slightly younger to mee
but send a Pm to Andy ( http://lumberjocks.com/Brit ) he knows one or two things about English saws :-)

Dennis