This is a Gretsch Bigsby (B6). It first came to our family in the 60's. My brother told me he took it off of a Gretsch Viking guitar from way back then and was put on a Gibson ES 125 where it has spent most of it's life so far. It's in the very rare original gold. 

The spring, although from the 60's as well, is not original. The mounting screws are not included. The felts on the back are in good shape. It has nice patina. The originals are not all that common.

If you have any questions - ask away and I'll try and answer.

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Thanks for looking!