Ladies Constellation cal. 1455 Crystal Replacement

Case #7950826 appears to be for a gold plated ladies DeVille, not a Constellation. Can you double check that number?

I see a case number 055DS7980876 that is a Constellation with a 1455 movement, that uses a 16 mm diameter flat sapphire. I'm guessing there was maybe an error writing down the model number at the store...not sure but the crystal for that is 062SN0549.

To be sure I would get a watchmaker to pop open the case and verify the case number inside.

To do the replacement properly you will need a new case back gasket, and new crystal gasket. These are both hard plastic gaskets that due to compression are single use only.

Cheers, Al