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The Tektronix 11331 was a prototype scope that was renamed the 11401 before going into full production.

Regarding the 11331 in the photo, Tom Rousseau says:

Definitely an early 11401, but after we changed to the 9” CRT, so not the earliest. I recall that the nomenclature hadn’t finalized early in the project, so we were probably still operating under the nomenclature that we were using from the product proposal. I recall pestering marketing to settle this fairly early, eventually resulting in the scheme that was used.