Impact of replacement cases on valuation

[cw_nyc]

Hi all,

Just wanted to get an expert's opinion on this as I can't seem to find a clear quantitative answer online (other than all-original, triple-signed watches being generally more valuable). If I were to buy a Patek with an original movement and dial, but a replaced case, by how much should I haircut the original value, and how much would that impact its potential resale value? The new case is in 18-kt gold, also Swiss-made, if that matters.

The condition is great otherwise.

Thanks all!
Cathy

[Tony64]

To be clear, is the replacement case from Patek?

[lapince]

If the case is not from PP then the thing is worthless, you'll never be able to sell it, so original watches only, no frakenwatches

[cw_nyc]

It is not from Patek. It is Swiss and 18k gold but not Patek. While I was sitting on it someone else bought it - relieved it wasn't me! Thanks for the quick responses!