Ok, I win cheapest watch award!
By: wover : October 24th, 2020-08:20
And oldest, from 1970! Seiko 'world timer'. And no, it is not an 'error dial'. The dial is period correct. Tho the optical properties of the acrylic 'crystal', which is really PMMA, a polymer, are superb, the anti reflectional properties are non existant....