This sale is for a mint condition Mamiya 7 43mm f4.5 Lens Hood, suitable for use only with both the Mamiya 7 / 7ii 43mm and 50mm lenses.
This lens hood has absolutely minimal signs of use; it is probably unused. Although marked as just 43mm, the same hood is also used for the 50mm lens; this is just one of the earlier ones made before the 50mm lens was introduced – the last production runs say both 43mm and 50mm on the hood.
This is the proper bayonet-fit Mamiya lens hood, not a cheap screw-in clone. Try finding another one – these are almost impossible to find. There is just one on eBay advertised below £100 (in Japan – good luck with importing that one as you need to add shipping and import duty) – most are well over. This one is a bargain.