Standard SR-F21
Another look at the inside giving a better glimpse of the transistors: 2T512 - 522 x 2 - 66 - 65 x 2 - [1T23 - bakelite] (My grey one differs: 2T512 - 521 - 523 - 64 - 65 x 2 - [1T23 - bakelite])
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