Microsoft Word by default does not kern text. The text of the memo is not kerned.
I hope this puts an end to the kerning discussion.
However, Times New Roman uses a characteristic of Microsoft TrueType fonts called the ABC dimensions, where the C dimension is the offset from the right edge of the bounding box of the character to the next character. If this offset is negative, the character with the negative C offset will overlap the character which follows (in some technologies, the distance from the start of one character to the start of another is called the ?escapement?, so a negative C offset gives an escapement which is less than the character width). This gives the illusion of kerning, or what I sometimes call ?pseudo-kerning?.
I think you spoke too soon. While MS Word by default turns off kerning, the MS True Type Times New Roman font apparently has a pseudo kerning capability. That being the case, how likely is it that the memo would match practically pixel per pixel with a document produced with MS Word if it had really been written in 1972?
It is the precise match to TrueType spacing that is the smoking gun. This is a propriatary spacing invented in 1981. No earlier typesetting system could possibly match it, except possibly a photo typesetter with infinitely complex hand manipulation.