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Need Help with Porsche Design Lemania


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Can anyone help me giving me a clue how to open this case? I've got it for repair from a friend who bought it as it is now. In order not to extend the damage of the back I tried to glue a nut on the case back and tried but no luck. And I must say the force applied was quite big.... Any suggestions? IMG_20221121_194215.thumb.jpg.3a142ea40f264a836a6d84b8d16792e0.jpgIMG_20221202_102527.thumb.jpg.cec44ac80b8889f0e89a96882ff25fc8.jpgIMG_20221123_201013.thumb.jpg.cf2b555fa0f5cc62487677b06b959ae1.jpg

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The indentations on the back certainly suggest that it is a normal screw fitting back.

Is it the genuine article? it may just be that it is a fake with a snap on back made to look like a screw on fit for the sake of authenticity.

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Those indentations don't look factory-made to me, and the back looks lik it has been sqeezed downwards in the middle. If it is a snap-on back, and it has been deformed to concave in the middle, then the rim will have been forced outwards. That would make it very difficult to remove.

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On 12/5/2022 at 12:39 AM, Nucejoe said:

Could be that the back doesn't belong and someone just glued it.

Have you tried heat, if you have a soldering gun.

Thanks to all for replies, I've tried too aply some heat( to the amount that you bearly touch with your hands) and I tried a stronger adhesive.... Stil nothing... 

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The last adhesive is rated to 180kgf....

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From the front, your watch looks very much like this one: https://www.dorotheum.com/de/l/7420070/

If that's the same model, it suggests the back on yours isn't original. If so, who knows how it has been secured? It looks terrible anyway, so no loss if you destroy it, but there is a big risk of damage to the case. It won't unscrew, so my guess is, it's not threaded, just glued in place. If you are determined to remove it, and you can get a lever under the edge, try levering it, working your way around the circumference to break the bond. Another possibility would be to trepan a big hole in the back, remove all the fixtures and fittings, then get to work with heat and chemicals.

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