I have x-rayed several original wooden atom 40s. Most are unweighted and weigh between 2.6 and 2.75 oz. I have one that is weighted, it carries a 2.85"x 1/4" through wired tail weight that extends from the tail to the back belly hook. That plug weighs about 3.6 oz. I have also seen an early wood A-40 (the one with the paper work about the canal contest results) that had a belly weight. I couldn't xray it, but did weigh it and it weighed about 2.75 oz. I suspect that Bob Pond did weight some to compensate for variations in the plug body density, but quickly gave it up as being too much trouble.
You might be interested to know, however, that a recent commerical reproduction of the A40, that fishes very well, carries both a belly weight and a tail weight, even in the junior size. The Blue Streak versions of the A40 also were tail weighted. PM me if you want more details.
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