The MBK/MBW's are a really good base.
- Bezel assembly is much better than modern Cartel models.
- Crown is spot on.
- Case specs and compatibility with gen parts is much better than Cartel.
Add a leather NATO (to cover up the POLEX DESIGN) e.g. Two-Stitch straps Amazing finish & leather quality (1,3 mm), and only aprox 60 USD.
https://www.twostitchstraps.com/collections/leather-nato-watch-straps/products/black-leather-nato-watch-strap
OR
A Chevron "Tudor Black Bay"-fabric strap from Crown and Buckle. 32 USD (!!!)
This one looks great with vintage tinted lume...
https://www.crownandbuckle.com/chevron-adjustable-night-harvest.html
I have a Rubyswatches 5513 insert that will suit a vintage Sub like this well (the left one)