Yes, ETA movements will fit in a Ruby case. Here’s what you need.
Yuki adapter/movement ring. Holds the movement in place in the case:
http://www.yukiwatch.net/ETA-adaptor-retro-fit-cal-15X0-case-p35063689
Yuki movement clamps and screws. Secures the movement together with the movement ring in the case:
http://www.yukiwatch.net/Setting-Bridge-and-screws-for-ETA-adaptor-set-p35127634
Rafflestime dial spacer, supports the dial sitting on top of the movement.
http://rafflestime.com/dial-movement-spacer-for-eta-2824-2836-or-others-that-fit/
Found a link to someone who did a similar build:
https://forum.replica-watch.info/fo...first-build-5513-submariner-with-vietnam-case
Yuki adapter/movement ring. Holds the movement in place in the case:
http://www.yukiwatch.net/ETA-adaptor-retro-fit-cal-15X0-case-p35063689
Yuki movement clamps and screws. Secures the movement together with the movement ring in the case:
http://www.yukiwatch.net/Setting-Bridge-and-screws-for-ETA-adaptor-set-p35127634
Rafflestime dial spacer, supports the dial sitting on top of the movement.
http://rafflestime.com/dial-movement-spacer-for-eta-2824-2836-or-others-that-fit/
Found a link to someone who did a similar build:
https://forum.replica-watch.info/fo...first-build-5513-submariner-with-vietnam-case