A quick hologram question!

  1. for all you chanel connoisseurs out there i was wondering if anyone could tell me when holograms were introduced? i'm looking at buying a vintage chanel purse and it's roughly from the 70s. the seller says that she bought it from an estate auction and can't seem to find a hologram however she has excellent feedback (power seller, however most of these items aren't fashion or designer ones she seems very honest and lovely!)
  2. consensus is mid-ish 80's.