Further to Sailor Steve's answer - might be due to the fact there are no number 1s on typewriters, you use lower case 'L's instead. So lower case 'L' is reserved for number 1, and all KTBs were typed up on typewriters on return to base.
Combine that with the fact that most military telegraph printers of the day printed in lower case (in order to differenciate between 'o' for Oscar and the number 0), so there's no way of differenciating between a '1' and an 'L'.
Don't know that for a fact, just those two seperate bits of trivia (I use a typewriter at work oddly enough) might also be contributing factors in this typographical conundrum.
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