Poor Stewart,

ooooh, it does hurt to see what the back looks like now.
I feel with you - got the exact same model, too.
It was in fact one of the first Heuers I bought some years ago, though not really a well known classic.
Must admit mine doesn't get much wrist-time (and isn't really one of my favourites), but it sure has an excellent "readability", and apart from that the movement runs extremely well.
All I had to do after I bought it was to change the glass, which fortunately caused no problem, and after I (idiot!) accidently dropped it once (ouch!) it needed a (fortunately only little) repair - being surprisingly quite resistable.
My back opened very easily, luckily - even I could do it, also only equipped with the standard (basic) instruments.

Can't show a picture right away, sorry. I wear it with a black rubber strap, one of those that look like a tire-profile, if you hopefully know what I mean.
I like mine that way, but must say that I like your brown leather strap too. Looks good !
And of course those photos are - as usual - great work !

So now I took mine out of the "showcase" I've got at home, after having payed too little attention to it for quite a while; took it and enjoyed holding and looking at it closely.
Thanks for the inspiration ! :-)

Cheers,
Olaf