Screen caps...
MOD watch cover again (for reference)

Clemens' watch
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clemens watch.JPG [ 37.81 KiB | Viewed 7694 times ]
The cover is very clear.
The big photo shows what definately appears to be a standard MOD watch strap.
Aaron's watch
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aaron watch.JPG [ 34.19 KiB | Viewed 7694 times ]
Again, the cover is clear.
The top left picture shows that Aaron's strap is not a standard MOD strap.
Other things I discovered during capture...
Most of us have seen the photo of the blood stained/rusted detailed Aaron Dogtags which show a printed barcode lable stuck on. (can't find it now I need it)
It was thought that these were a "stunt version" and the originals had an engraved barcode.
Looking at this photo, I'm not convinced. Hard to tell from the photo, but watching it - the way the light reflects off them as they move - it appears to show the barcode as a stuck on label as per the "rusted" tag photo.
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detailed dog tags.JPG [ 25.31 KiB | Viewed 7694 times ]
Aaron only appears to wear those tags in that one scene.
During the remainder of the movie he is seen wearing these tags:
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standard dog tags.JPG [ 6.58 KiB | Viewed 7694 times ]
Barcode is located in the centre of the tag instead of along the edge; no text; barcode is only on the one side of the tag as can be seen from the left hand photo.
Finally, the belt.
Looks very much like that german Army brass belt buckle.
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belt.JPG [ 14.02 KiB | Viewed 7694 times ]
German belt:

I've just bought one which very definatly doesn't have a 'thin end' to the belt.
While not 100% certain that's what was used, it's faily convincing. Even if not, they're certainly pretty damn close. For less than £5 I think it's worth a shot.