If you look at the other four bores on the site for sale, They all have a similar configuration. I think this would support the theory that they were Birmingham made to order for the maker Whose name is emblazoned upon the rib.

In fact, someone is liquidating a very impressive collection of 4, 8, and 10 bores via Mr. Marriott. No fewer than 13 four bores are for sale. How about a pair of Watson brothers four bores, New and unfired.Many of them do not have prices and are in very high condition. Quite a few of them are marked sold. Some of the more rare ones were posted and within one day the vendor brought out the sold placard. If you like big bores of the British persuasion you owe it to yourself to browse his site for a visual Feast.
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Owen