Please, Can someone authenticate this vintage monogrammed grey and black Gucci purse?

[Lisa Pate]

I hope I'm doing this correctly. So sorry if not. I'm new here. I found this Gucci purse at a thrift store and I'm hoping someone would be so kind as to authenticate for me

Item name: unknown
Type: Grey & black Monogrammed
Who took pics: me
Link: none
Seller: me
History of the bag: i bought at a thrift store 2 days ago

serial number 001 3306 002045

 

[Swanky]

Hi!
All authenticity questions must be posted in the Authenticate This Gucci thread we've provided.Thanks!