Howdy, Well I don't remember Chester with an Epiphone...... so I had to do a little research. Turns out that he started out with a Gibson L10 in the late 30s that got broken and replaced with another Gibson, a L7 this time, and played that pretty much exclusively right up until he was fixed up with a D'Angelico Excel in 1950. Then Gretsch hooked him up with a prototype 6120, which was shelved for the Iconic "Country Gentleman" in 1959. The new model was designated 6122 and was pretty much Chet's signature guitar from about 1960 til the end.
Couldn't find any references to an Epiphone that he actually used on stage or in recordings, although I would not be surprised if there might not be a few "Signature" model/brands out there..... kinda like the Joe Pass Epiphone that Joe likely didn't play except at some trade show somewhere, but was built to the specs of the Gibson that he did play.
As a bit of trivia for ya though, The Gretsch that Chet did play "looks" like a "F hole" hollow-body..... but is not ported. The F holes are actually decorative decals that Chet liked the look of but serve no other purpose.
That first Gibson L10 had belonged to Les Paul, and Chet's older brother Jim played guitar in Les' orchestra and acquired it. He gifted it to his kid brother when Chet was 12 years old.
The Gretsch G6122 Country Gentleman is still in production and lists for just a tad under $3800 with the original type Filter-tron pups and Bigsby.