Hepkat67
Electromatic
Very interesting article from "Pickin' & Singin' News" dated Aug. 31 1954.
First 6120 has been already delivered to Chet Atkins "several weeks ago" and should feature a "tremolo tailpiece designed by Atkins and Tom Collins"
So it would mean that Chet has his first prototype delivered round mid 1954, meaning also that developments for the 6120 were probably ongoing since roughly early 1954.
Also, by time of writing (if we can give credit to this article), Bigsby vibrato was not yet chosen as standard

First 6120 has been already delivered to Chet Atkins "several weeks ago" and should feature a "tremolo tailpiece designed by Atkins and Tom Collins"
So it would mean that Chet has his first prototype delivered round mid 1954, meaning also that developments for the 6120 were probably ongoing since roughly early 1954.
Also, by time of writing (if we can give credit to this article), Bigsby vibrato was not yet chosen as standard
