Bill,
I sympathize with your frustration regarding Lefever info. Years back I decided my only recourse was to start building my own database. In time, I connected with others and we agreed to share.
I do the same for a few other makes I collect - Sneider, SAC, and others.
So to answer your question as to my source...my answer is "me." My background dovetails nicely with such an information collecting endeavor, and I can mine my information for stats, oddities, etc.
The dispersion of serials we have is fairly even across the years. At current, 10's represent slightpy less than 10%. 16's account for nearly 12%. But because 16's are primarily in the lowest grades, the survivorship should be naturally lower. As such, the odds are that more 16's havent survived the years, and I therefore reason that the gap in percentages is likely larger than 10% vs 12%.
As a statistician, a sample pool of 10% of any population has a very high reliability ("confidence interval"). So when we reach roughly 6,000 serials, I'd say someone should be penning an updated book.
I'll bet it would sell tens of copies !!
NDG
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