Advice In Going A Little Deeper With The 1851 1¢ Franklins

I'd like to expand beyond a single example of each of the [affordable] Scott catalog numbers, and get at least one example of each of the major recuts (and broken framelines, double/triple transfers, and cracked plate examples) of Scott #7 and #9 (mostly #9).

I'm not sure what I'm looking for regarding "2 recuts" in the top or bottom. I can identify recuts, but for "2 recuts," am I looking for 2 different spots that have been recut, or am I looking for a recut on top of a recut, which would have to show up as either misaligned recuts or 3 different thicknesses (very thick in the middle where the line was recut twice, thick outside of that where the line was recut once, and thin where the line was not recut at all).

Is there a shortcut to finding VF+ examples of these stamps at fair prices, or is it the usual process of checking ebay, auctions, dealers, and individually examining each stamp to see which variety it is (since they are almost never identified other than by Scott #)?

I have the same dilemma in trying to get a 64 and 64b - trying to buy certified of those seems difficult. So many advertise they have a 64 or 64b but without certified stamp I am not knowledgeable enough to know.

I think 64 and 64b are pretty straightforward. They are expensive enough to warrant certificates. Sellers like Rupp Brothers, Ed Rieser, or Gary Posner have certified examples to sell regularly.

The 9 variants are not really expensive enough to cert. my main problem is getting from a beginner-level of identifying types to an intermediate level before going Nieken-level deep on the issue.

Philazilla: For copies of #9, Type IV with "double recuts" you are looking for recuts in two different places: both the outer and inner frame lines of the labels with the lettering U.S. POSTAGE and ONE CENT. See the attached image taken from Neinken page 112. You can see the inner recuts between the P and T of POSTAGE and the E C of ONE CENT. All positions on Plate 1 Late except 4R have at least one outer frame line recut. Fewer have inner frame lines recut. No position has an inner recut without also having an outer recut of the same frame line.

Thank you Dudley - that is very helpful! I have a digital copy of the Nienken book and would probably have eventually figured this out, it is very helpful to know this detail before trying to go deeper.

You may find this publication, from the Siegel website, useful (or way too much information):
https://siegelauctions.com/enc/pdf/1c1851.pdf

Thank you Germania - this is perfect!