5700? My second favourite Rolex.
Stay away from the jubilee bracelets (unless they really float your boat) as they tend to be prone to more wear and tear over the decades.
If you want one I'd consider getting your act together. They're gradually appreciating in value due to the fact they aren't made any more and are becoming harder to find in good condition.
I bought one a while back but flipped it on because there was some case work required and I wasn't prepared to spend the money or take the risk to have one of the lugs opened slightly to get the bracelet back on it.
You can pick them up for about £1k if you want one on a strap. Looking closer to £2.5 to £3k for a premium example with box, papers and minimal bracelet stretch.
EDIT: IMHO if the professional photos can't hide the bracelet stretch then its going to be pretty floppy when you try it on. I'm not saying that you should avoid a watch with bracelet stretch just take into consideration that if you are lucky enough to find a NOS Airking bracelet it will cost you a small fortune. This example looks to be about £400-£500 over the top to me. Even the end pieces seem to have some play in the lugs. That said, I'd take their hand off at the wrist if they would accept an offer of £2k :D watchfinder.co.uk/Rolex/Air-King/5700/26937/item/47312