[InterceptPoint]

The different "ones" is suspicious. OTOH 60's vintage typewriters often had no "one" and you were expected to use a lower case "l" for a one. People got used to that. So a typewriter that had a real "one" (I'm assuming there were some that did but can't prove it) could result in someone inadvertently mixing both styles on one document.

Here is a photo of a 60's typewriter with the numbers 2-9 plus a zero but no "one".

[wndawmn666]

Makes sense, thanks.

[OXENinFLA]

I gotta go with the typewriter being used HAD A “1” KEY, and for what ever reason the person typing this happened to use the “1” key for the 1st line then after that habit typing took over and they used the lower case “l”.

I’ve come across a few popular 1960 era typewriters that have the “1”

http://www.mrmartinweb.com/type.htm#triumph

http://www.mrmartinweb.com/type.htm#brother