Vocas MB-430 Mattebox lens mount_Fuji GFX 8 Super-Multi-Coated Takumar is a

8 Super-Multi-Coated Takumar is a compact standard lens for the M42 thread mount

Unless you want to do video

Increases the effective focal length of the lens mounted to it by forty percent while maintaining complete communication between lens and camera

with minor cosmetic wear which does not affect function

I'd wager to say

Vocas MB-430 Mattebox lens mount_Fuji GFX 8 Super-Multi-Coated Takumar is aThe Vocas MB 430 is a well made three stage mattebox with a pair of combination 4x4 4x5. 65 frames (one with rotation) and a 4x5. 65 slot inside the hood. Constructed with aluminum and carbon fiber, the MB 430 includes the Vocas 138mm diameter adjustable cuff donut and the Vocas LW Swing Away Bracket for 15mm rails; does not include flags. A solid professional matte box in excellent condition.