Yairi 5060 with adjustable bridge
I recently acquired a Alvarez-Yairi 5060. It has an adjustable bridge, which I suspected was a modification, but that the original owner says is as it was when he bought it new. It's dated 1/1/1972 and has serial# 304.
Can anyone confirm that the 5060 was offered with an adjustable bridge option, and, if so,
provide any additional info? It sounds great, so I probably won't change it, but it'd be nice to know for sure.
Here are a couple photos of it:
Any info would be greatly appreciated!