The 33 DHE .410s in the production chart are assumed to be, as you suggest, 00 frame dedicated .410 guns, not part of sets, very hard to find, because some probably got converted into sets. The 0000 frame BHEs, which the production chart lists as 9 built, are a completely different animal. However, the 9 BHEs are not the complete production of 0000 frame guns, as I stated in my earlier post.
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