I'd say ....
By: Marcus Hanke : June 14th, 2009-08:26
.... that the UN steel bracelet is in any case heavier and more solid than that of any older Rolex. While the older Rolex bracelets often did not have solid center links, neither solid end links, and a rather lightly stamped clasp, all these parts are solid steel in a UN bracelet.
Regarding the watch itself, it depends on the version you chose of the UN. The 40mm variant might be a little lighter than the 40mm Explorer II, but the larger UN dual Times are certainly heavier.
Regards,
Marcus