Cheers. The watch is a J.W. Benson with 16j Smiths Movement dating from the early '50s. It has a very similar dial pattern and movement to the 1953 Everest expedition Smiths watch worn by Sir Edmund Hillary.
The strap is a Donegal tweed 'mid green salt & pepper' made by Andrea at Martú. For details, see here: [url]http://forum.tz-uk.com/showthread.php?408460-Roll-up-roll-up-Get-your-Donegal-tweed-straps-here