​1950-60's Greco Tremolo Unit

1950-60's Very early Nickel Greco Tremolo. This is very rare, we have not seen one before. It was MIJ by company called NSB Japan. It resembles a Very early Gibson Mastro vibrato, it has a similar curved spring just like the Gibson. It obviously had a full G with the long leg type mother of pearl inlay. The handle is not original.