I bought dad one of those Lumibrite Lorus military style watches. It was waterproof (excellent for care homes!) and easily read by "older" eyes, even in the middle of the night when you need to "go"!
http://www.watchshop.com/mens-lorus-...p99955886.html
http://www.argos.co.uk/product/2535975
May be too small but worth a look at peanuts price. I gave it to his carer when dad "left"!