Nick, in the first edition of Elliott's book, the ten gauge was not included in the "rarity chart" that did list the 16 as quite rare. In the second edition, the sixteen was listed as half the production estimate compared to the ten gauge. I am getting my estimates empirically, but would be interested in your sources. I have not had a lot of success in getting any information from the source you are probably referring to. One particular researcher gladly accepts my research but will not share his, in fact is very snitty about anyone who asks. Personally, I have found a kettle of ten gauges for every sixteen collected.
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