How do you tell an Original Lyre vs Repro?

[Rox]

I was looking for a Lyre vibrato for my SG/MM, and snagged one which is supposed to have come off a mid-60's Standard. It should arrive with me sometime in the next week.

The price is less than buying a brand new reproduction so I think I've got a good deal; but my question is, how can I tell if it really is an original?

Obviously things like the arm screw may have been replaced over the years... so what do I look for?

I won't be upset if it turns out to be a repro, seeing as it was still cheaper than buying one of those... I'm just interested... :)

 

[Biddlin]

The wear and patina on an original mid 60s vibrola should be fairly even, not just dull, here and there. The scribing should be as aged as the smooth metal. The walrus tooth should have a slightly burnt yellow look with some stress fracture lines, if it is original. The chemical aging on custom shop pieces is obvious enough, looking like someone dripped pool acid on the plating.(Wonder why).
Lots of pictures, or it didn't happen and I'll be happy to give my valueless opinion on its DNA. Here's the custom shop aged model:

;>)/