(They're all using plastic-handled hard-point saws these days, which you don't have to sharpen - because they can't be sharpened, they're disposable. Made in China, dumped in Britain, I suppose.)
It's a 26 inch S&J Sovereign - indicated by the green label around the medallion - with the beech handle attached by proper brass saw nuts, and a 6 stamped on the heel of the blade for 6 points per inch. It probably dates from around 1950 and, apart from losing varnish, shows very little wear since leaving the (long defunct) Sheffield factory. I'm delighted to say the blade is perfectly straight and cuts well, so I'll be cleaning away the rust spots and sharpening its teeth for future use. A good three quid's worth, I reckon.