Andre Matos

Hello Friends, I got this lens and it has nothing written, no serial, nothing that can indicate the origin and manufacturer. The size seems to be 8mm, if someone has seen something like this thank you for any help, the back thread has 37mm, has already come with this clamp, the front outside has 50mm and the length is 10cm, it has no focus system only one Screw that locks the back and allows to slightly externder the body. I tested here holding it in hand, She does not vignette over 80mm, and the scale is between 1.5 and 2x, I need to do better test and confirm. I appreciate any help,