The No. 18202 is the fine replacement blade for the Z-Saw Tuck-In 210 Fine (No. 18002), the compact folding saw for green-wood pruning that cuts sawn timber too.
It's the same 210 mm (8.3 in) blade the Fine saw comes with: 0.8 mm thick, with impulse-hardened teeth at a 2.15 mm pitch (12 TPI) and a 1.08 mm kerf. The blade is held by a coin screw, so a coin is all you need to change it.
Z-Saw's maker, Okada Hardware, has made saws in Miki, Japan since 1943 and was the first company in Japan to impulse-harden saw teeth.