Is 7 Groove Case M3 unique

[Knightman]

I have added to my collection a WWII blade marked "Case M3" with a 7 groove grip. Cole's example shows knife with 8 grooves and I've seen several listings online referring to a sellers "rare 7 groove Case M3". So my question: Is the 7 groove rare and somewhat unique? Or is it just a variation that adds no more value to the knife?
Thanks.

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[browningautorifle]

I've seen examples with 7, 8...don't believe just because the sellers say they're rare means it's so. Look on line and see, count how many you find with both...