This is the replacement blade for the Gyokucho Plant Hunter Mini, the small folding pruning saw with a 100 mm (3.9 in) blade and a cherry handle.
It has the same specs as the blade on the saw: 0.6 mm thick with fine komame crosscut teeth at a 1.5 mm pitch, cutting on the pull stroke with a 0.9 mm kerf and leaving a smooth cut on live wood. When the teeth dull, fit a new blade and keep your 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.