The S-297 is the replacement blade for the Gyokucho No. 297, a 180 mm dozuki built for dovetails and small joinery.
It has the same specs as the blade on the saw: 0.3 mm thick with a full-length metal back, fine teeth at a 1.0 mm pitch (25.4 TPI), a 0.46 mm kerf and a blade depth of 37 to 45 mm (1.5 to 1.8 in). The teeth are impulse hardened, so they stay sharp a long time but aren't meant to be filed. When they 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.