There is one guy with a Wessex DB every year at the Tombstone, AZ Tuba Christmas.
The smaller bell looks to be just over half the large bell diameter, and without exception vintage small bells are about 1/3 the size.
I have listened to him play both circuits, and can't really say there is a noticeable difference.
I'd pop for a restored/cherry older DB and live with the quirks they have.
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