6122 Country Gentleman Milestones

1958
6122 Country Gentleman introduced, with single-cutaway body.
1962
Country Gent switches to closed, double-cutaway Electrotone body. These '62 and '63 "Harrison Model" Gents can be easily spotted by their twin dial-up mutes with red felt, plain pickguards without "Country Gentleman" on them, and Grover Imperial tuners.
1964
Grover "kidney bean" tuners replace Imperials, a SuperTron pickup is fitted, and "Country Gentleman" appears on the pickguard.
1967
SuperTron goes away, reverting back to a pair of FilterTrons, and double mutes give way to a simpler (and cheaper) single-mute setup.
1970
6122 designation dropped as the Country Gentleman becomes the 7670 model.