Thanks. If it's not a CS, the certificate, back plate, tool kit, strap, user manual etc have been well forged. In any respect it plays the best of any of my basses. I suspect from what you say, combined with the pictures on the web that the machine heads have been 'forced-aged' to a degree not commonly seen.
I might leave well alone and see what the look like after 10 years of my grubby fingers. Thanks for the feedback.