1846 Newcomb-43 Reverse Die Lines

Most of the coins that Newcomb was working with were higher grade examples, usually EF to Unc, and even Proofs, with the exception of a handful of very rare varieties. Once you get into the Braided Hair coins, the number of Newcomb varieties grows quite large vs. the Coronets.

As a result of his having a great deal of higher-grade specimens to look at, many of the finer diagnostics that Newcomb uses in his descriptions (die lines, "points" down from letters, etc.) are die features that wear off quickly below EF grades and cannot easily be seen with the naked eye, or sometimes, even with a 10x. This is one reason why Bob Grellman came up with his 6-digit identification system for the Braided Hair cents, which allows you to identify Newcomb numbers for coins all the way down to AG or even Fair in some cases as long as the date and bottom of the bust are fully visible. Grellman's numbering system is nowadays more commonly used than Newcomb's book for the late dates when attributing a given coin, and with Newcomb's book long out of date, Grellman & Noyes have become the go-to references for Newcomb varieties and die states.

Yes, that's it, Beefer, you nailed it :)