GAI Old Flip Question

I stared at the flip on this for awhile thinking something didn't look right, then realized the "mint" is missing. Is this typical of flips from this era?
1971 wax pack GAI 9
1971 wax pack GAI 9
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Edited to add: It is in the first generation flip and a "100" to boot so maybe they did only give out numbers in the beginning. Hopefully Tim will chime in.
But I have promises to keep,
And miles to go before I sleep,
And miles to go before I sleep."
"Life is what happens to you while you're busy making other plans."
Collecting:
Any unopened Baseball cello and rack packs and boxes from the 1970's and early 1980s.
Collecting 1970s Topps baseball wax, rack and cello packs, as well as PCGS graded Half Cents, Large Cents, Two Cent pieces and Three Cent Silver pieces.
<< <i>I stared at the flip on this for awhile thinking something didn't look right, then realized the "mint" is missing. Is this typical of flips from this era?
1971 wax pack GAI 9 >>
That's a lot for that pack imo. Yes, I'm being that guy who totally wants it and won't/can't pull the trigger at that price, but I'm confident that's too much even though the pack is awesome and hard to find. I'm very curious to see what it goes for.