I recently modded my own 3714 case to fit gen parts thanks to some great tips from great members here. It's been a long journey trying to find someone to take this on. But if you have the necessary parts and tools in hand, you can actually do it yourself in a few hours. Again, this is not the only way to do this but the easiest.
In my experience, the best case to use is the older one (V1) with the extra set of holes in the midcase for the bezel screws.
In my opinion the new cases (V3) seem off. I think the bezel is much thicker. Plus these are the bezels that are pressed in. If you wanted a gen tachy, you'd need to have heavy machinery to mod both the bezel and midcase
Mid-case
The movement will fit in the case, no problem! However, the gen movement is thinner than the rep. The resulting issue is that the tube hole for the case and the stem hole for the gen movement don't line up.
Also, the holes for the movement tab don't sit flush with the case
Solution...to be updated.
Result:
Bezel
You can see the differences between the gen and rep bezel and their respective tachy rings. The major plus is that the gen bezel can fit right on the rep mid-case without any work!
This is because the 4 holes in the rep bezel have the same alignment as the 4 holes in the gen tachy. Therefore, you can tighten the gen tachy right to the mid-case.
Top view
Bottom view
The caveat is the rep bezel screws are too big to fit into the gen tachy
Bezel+Tachy+Crystal assembly
This is the worst part of the whole building process. I always have trouble pressing the crystal into the bezel and actually shattered a crystal doing so.
You'll need two crystal gaskets (sorry but I don't know the size exactly. Once I find my calipers, I'll update this). One gasket goes around the gen tachy. The other goes around the crystal. Tachy can be pressed into the bezel from the bottom. It has a bottom lip that will prevent it from going too far. Crystal can be pressed from the top of the bezel.
Dial+Hands+Movement assembly
To be updated
Crown+Stem
The gen and rep crown/stem are interchangeable with the gen movement. Since the cal 79350 is a 7750-based movement, you can use an ETA 7750 stem (tap 10, 0.9 mm)
Final Assembly
This is a front loaded watch so the dial+movement has to be set from placed from the top. The dial has a larger diameter so the outer portion will sit on upper lip of the case. The bezel assembly will then sit on top of that and sandwich the dial.
This is an incomplete write up (which I intend to complete in the future) because:
1. I don't have necessary tools like a vernier caliper to give you exact measurements
2. There's a lot more involved and I don't currently have the time and all the photos to go through the details.
In my experience, the best case to use is the older one (V1) with the extra set of holes in the midcase for the bezel screws.
In my opinion the new cases (V3) seem off. I think the bezel is much thicker. Plus these are the bezels that are pressed in. If you wanted a gen tachy, you'd need to have heavy machinery to mod both the bezel and midcase
Mid-case
The movement will fit in the case, no problem! However, the gen movement is thinner than the rep. The resulting issue is that the tube hole for the case and the stem hole for the gen movement don't line up.
Also, the holes for the movement tab don't sit flush with the case
Solution...to be updated.
Result:
Bezel
You can see the differences between the gen and rep bezel and their respective tachy rings. The major plus is that the gen bezel can fit right on the rep mid-case without any work!
This is because the 4 holes in the rep bezel have the same alignment as the 4 holes in the gen tachy. Therefore, you can tighten the gen tachy right to the mid-case.
Top view
Bottom view
The caveat is the rep bezel screws are too big to fit into the gen tachy
Bezel+Tachy+Crystal assembly
This is the worst part of the whole building process. I always have trouble pressing the crystal into the bezel and actually shattered a crystal doing so.
You'll need two crystal gaskets (sorry but I don't know the size exactly. Once I find my calipers, I'll update this). One gasket goes around the gen tachy. The other goes around the crystal. Tachy can be pressed into the bezel from the bottom. It has a bottom lip that will prevent it from going too far. Crystal can be pressed from the top of the bezel.
Dial+Hands+Movement assembly
To be updated
Crown+Stem
The gen and rep crown/stem are interchangeable with the gen movement. Since the cal 79350 is a 7750-based movement, you can use an ETA 7750 stem (tap 10, 0.9 mm)
Final Assembly
This is a front loaded watch so the dial+movement has to be set from placed from the top. The dial has a larger diameter so the outer portion will sit on upper lip of the case. The bezel assembly will then sit on top of that and sandwich the dial.
This is an incomplete write up (which I intend to complete in the future) because:
1. I don't have necessary tools like a vernier caliper to give you exact measurements
2. There's a lot more involved and I don't currently have the time and all the photos to go through the details.
