75th Birthday watch for my father, suggestions please.

[jayfish]

As per the title, but with a limited budget of £150; not fussed as to leather strapped or metal, he isn't in any way image conscious, in fact he is decidedly understated in his appearance, slim-ish in build so nothing too large or showy.
I just want something he will appreciate as having had some thought given as opposed to the usual crap he gets from me because he's decidedly difficult to buy for
I'm not in any way a watch person, I don't even own one, so beyond the idea of this being an ideal gift I have no fricking clue where to start...
For purchasing I'm in striking distance of Tunbridge Wells, Brighton, Eastbourne so finding a retailer for suggested watches shouldn't be tough.
Thanks in advance.

[Vespula]

Seiko Kinetic SKA271P1

No batteries to buy.

35mm, so fits a slim wrist.

Push button to change the date.

Black and gold so very legible to mature eyes.

Bracelet doesn't wear out like leather (but it will need to be adjusted).

£148.99 on Amazon