Removing the back is step one. Now, remove the stem from the Mvmt., Remove both case clamps . Now lay the case back on the case only, not tightening. Turn over the watch and the movement incl. Dial rest on the back case now turn over again and have a close look at the dial/ onyx without distortion of the crystal. Take a better picture. And then reverse the procedure without ever touching the dial. Place the Case middle over the mvmt. Again, center the crown tube at 3 o'clock, turn over the case again, insert the stem and the loosely put back the clamps and their screws. The insert the at centered, press down the release button for the stem until it clicks in. Then tighten the case clamp screws and the back fitted right. Need one fitting screw driver for the case screws and a pin to press down the release pin for the stem. Viola! Then you know for certain. Good luck!
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