Mark is definitely the Buck man, capable of spotting his penmanship from a quarter of a mile away.
Here are some more cards with Buck Barker's handwriting on the back just to train your eyes. The one that says "Mitchell" on the back is a little deceptive in that most of the handwriting on the card is not his, but the "Oliver" above the Mitchell and the "Nagy 81" in the bottom right corner of that card is his handwriting (which happens to indicate who Buck obtained the card from, Frank Nagy in this case, and year obtained - 1981).
Brian
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