[Cheburashka]

“l” (lower case l) and “1” (digit 1) are two separate keys on a typewriter. Guess the dumbocrat that faked it thought it would look more realistic if both “l” and “1” were defective.

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Back in the sixties and earlier most typewriters were manual and didn't have a “1” key, and often no “0” key either. You produced a one with the lower case L key, and a zero with a capital O.

So if the letter was genuinely typed in the sixties it makes sense that the “1” and the “l” would both be printed defectively on the same machine.

[okie01]

Chegburashka is correct about the keys on a manual typewriter.

The separate "1" and "0" didn't start showing up until electric typewriters came along. Even then, I don't think the early electrics had these keys.