I've recently discovered the joy of designer resale/consignment here in NYC! And, I've come across several Chanel bags, all of which appear to be "vintage" (i.e. there is no hologram). So how do I go about figuring out if these are real Chanel if there is no hologram? What year did Chanel start putting holograms in? I've read that they started in the 80's but not all the bags have them? What points should I be looking for to authenticate a vintage bag? I looked around in the reference section, but am wondering if there are any other sources out there on vintage Chanel bags.