I'm having trouble to know if this is a legit "Giant" tag or not ? Please help

I'm selling my 90's Nirvana bootleg "why ?".. XL, no holes and still in good condition ! Asking for 750€ shipped from France
Length = 76cm
Chest = 56cm

I've got this Nirvana tee last week from a friend and i'm wondering if it's a boot or legit ?

Thanks for the reply, and no nothing is printed on the back

Thanks for the reply, what do you think it's worth ?

Do you have any idea how much this one goes for ?

Help identifying and pricing please

I really don't know anything about that type of print nor that tag