This is the replacement blade for the Gyokucho Fugaku Dozuki Universal (No. 111), the 240 mm folding back saw in the Fugaku line with teeth that rip and crosscut.
It has the same specs as the blade on the saw: 0.3 mm thick, with universal teeth at a 1.5 mm pitch (16.9 TPI) that rip and crosscut, and a 0.52 mm kerf. It's a good blade for dovetails. When the teeth dull, fit a new blade and keep your beech handle.
Gyokucho saws are made in Miki, Hyogo, by Razorsaw Kogyo, which was set up in 1969 when it developed the replaceable-blade saw. Gyokucho Sangyo, its sales company since 1975, sells them.