Aren't we fortunate with digital cameras these days, comparing with film before?
Your 6542 is almost a perfect specimen and the 5508 is the best I've seen( not that I've seen many).
I am still trying to learn the lingo for all the terms to describe the many variations ie. gilt, matte, maxi, big crown, chapter ring, fat lady, lollipop hand, mercedes hands, rail dial, high hat, super dome etc. Also the different fonts and lettering on the back and dial for different years and bracelet code nos. etc. Then you got to figure out the minute details that will help you spot the fakes.
All very confusing. There should be a full time course on this.
Cheers
fernando