“Columns 73 to 80 could therefore be used for identification information, such as punching a sequence number or text, which could be used to re-order cards if a stack of cards was dropped; though in practice this was reserved for stable, production programs”
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So, that’s what columns 73 to 80 are meant for!
https://en.wikipedia.org/wiki/Fortran#Fixed_layout_and_punch...:
“Columns 73 to 80 could therefore be used for identification information, such as punching a sequence number or text, which could be used to re-order cards if a stack of cards was dropped; though in practice this was reserved for stable, production programs”