My ES335 is a 33O?

 I have had a thin line hollow body guitar for years now.  I thought that whole time that it was a ES335.  It came with no markings except a Gibson double triangle on the head.  I believed it was a Japanese knock off from the 70's.  My volume and tone pots are going bad.  Three out of the four pots are really loose and one tone pot if not turned to one spot keeps the whole guitar from playing through the amp.

NOW! while looking into the guitar through the f''hole to look at the wires I find no solid body in the inside.  When I first bought the guitar I thought I could see the solid wood, but not now?  Also, the neck connects at the sixteenth fret.  So maybe it is a 330.

Notes for me later. I will cut and past incase the web page is taken down later when I need it again.

The Gibson ES-330 is a thinline hollow-body electric guitar model produced by the Gibson Guitar Corporation. It was first introduced in 1959.[1]

Though similar in appearance to the popular Gibson ES-335 guitar, the ES-330 is quite different: the 330 is a fully hollow thinline guitar, not a semi-hollow guitar with a center block. Also, the 330 has two single-coil P-90 pickups, in contrast with the two humbuckers on the 335.

The 330 neck originally joined the body at the 16th fret, not the 19th, like the 335.[2] In 1967/1968, Gibson changed it to join at the 19th fret. Current Gibson reissues are known at ES-330L to denote this longer ('L') feeling neck, and reissues of pre-68 330s have the 16th fret join as they would have originally. Note that the scale length of both models (16-fret and 19-fret) is the same, the body is just different (the 16-fret model has markedly taller upper bouts and thus more hollow body area).

The guitar has been produced both as a single-pickup instrument (ES-330T) and as a dual-pickup instrument (ES-330TD). Somewhat unusually, the ES-330T had its pickup mounted halfway between the bridge and the end of the neck, not in one of the usual neck or bridge positions. It has been available in sunburst, cherry, natural, walnut, and sparkling burgundy finishes. Tailpieces used are usually trapeze or Bigsby vibrato tailpieces. Due to its lack of popularity compared to the other Gibson thinline guitars (such as the ES-335, ES-345, and ES-355), the ES-330 was discontinued by Gibson in 1972. Since then, it has been reissued a few times by the Gibson Custom Shop division.

Famous ES-330 players include Emily Remler, B.B. King, Slim Harpo, Grant Green, William Reid, Roky Erickson, Chris Bell, Zoot Horn Rollo, Brian Jones, Brad Simpson of The Vamps and Elliott Smith.

It is notable that the ES-330 has a nearly identical cousin, the Epiphone Casino (Epiphone was and is a subsidiary of Gibson), which was played in particular by the Beatles’ John Lennon, George Harrison, and Paul McCartney, and The Rolling Stones’ Keith Richards./