Not visible in "normal" light conditions. Early Version of this lens. - No oil on aperture blades. - Aperture blades run fast. - Fully working in Manual and Automatic Mode. Can be seen on font of letters and numbers, the red "R" mark and the low serial number.
![[MINT] Mamiya Sekor C](https://images.buynet.work/thumb.php?i=387729946&s=240)