I need help identifying what watch this is

Hello, I have found a very good looking ad for a vintage Jaeger LeCoultre watch. The add says it is roughly 35 years old and I can tell from the stamp on the case back it is 18K gold. I would love to buy this watch but I don’t know what model or year the watch came from. Can someone please help me figure out what specific model and year it is from? Does anyone know what it is worth as well? The seller is asking $800 for the piece but I believe he does not know the full value, or is it only worth $800? Either way I will be happy to add this to my collection. From what I can tell it looks like part of the Master collection. It looks to me to be legitimate and the process I am paying with protects me from fakes so that is not a worry. Here are some pictures:

It's a fake. Stay far away.

Movement looks horrible.

I've seen that exact same case on a horrible fake Omega too. Was looking to see if I could find pictures of it but can't at the moment

Chunk of junk......

OP, all the above is kindly meant, and I think folks are genuinely a bit worried and perplexed - as JimInOz has shown, there's scarcely a line in your post that doesn't light at least an amber warning. I also spat my coffee at, "a very good looking ad". Seriously? The photos you presented were not of the quality you should be demanding of sellers before proposing to spend any money on anything. In this case, it doesn't matter, the watch was obviously unpleasant no matter who made it - but in future I hope you will insist on more and better from sellers before even entertaining their demands for your money.
Best wishes for your future hunting.