I think you are right Graeme .
Materials deteriorate over their 40 odd years of acquiring the mantle of NOS .
Repro's using modern quality materials are quite noticeable in fortitude.
A few years back I bought a set of original NOS weather strips with the metal insert . Good score I thought . Lasted 2 years before the splitting started . Scott's repro's have shown no sign of deterioration after 5 years and still going strong .
I think we get sucked in with NOS.
I would imagine that NOS P6 badge would go that way in a short time too when exposed to sun , rain , snow ,sleet and a polishing every sunday.
Gerald