JW Benson's factory was destroyed in the first world war (bombed by a Zeppelin if I remember correctly). After that, they bought a variety of Swiss movements which they cased themselves, though they didn't always make their own cases either. They went out of business in the early 70s. Anyway, there's always been some quality to their watches but no great following, which is hardly surprising given their history, or lack of.
They go for the same sort of money as other third tier makers - £3-500 - depending on condition and metal. I can't recall a Coronation watch - pictures will go a long way.
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