When I first looked at the label it looked like JE, but taking a picture and blowing it up, looks like IE, which makes more sense- most of the pot codes are first half of 1959, with at least 1 late 1958 thrown in. The transformers and choke look right, and the Astron tone caps are present. My 1960 has Triad on the Power transformer, but looks identical to the one in this amp, with the plastic leads. The speaker are not original, they are a combination of 1956 and 1957 P10R's- a blue P10R Jensen is what I would expect to see in a 1959 Bassman but these are slightly older, and silver. Sounds amazing, as Bassman Amps are prone to do. I have owned one for decades and they set a high bar. The mojo factor is off the charts. I would not have expected to see a rubber handle mid 1959, and the handle on the amp is a repro, but that is what it has always had. Basic servicing and a grounded AC cable installed. Thanks for looking!

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Coleman Music

1021 S Main St

China Grove NC 28023