I have been collecting the SC# CE2 and the varieties as identified by the Scott Catalog. I have an examples of the Type 1, Type 2, Type 3, and Type 4. I also have some of the Type 1 varieties. For example, I have a Type 1A that clearly shows the three (3) thin red lines and the one (1) thin blue line in the registration area as defined by Scott's. That one was easy. The definitions for the Type 1B & 1C are the problem. Scott's says that each one has two (2) thin red lines and one (1) thin blue line. The only distinction is that on the Type 1C, it has one (1) long thin red line and one (1) short thin red line along with the thin blue line. None of the potential candidates I have with two (2) red lines have lines of equal length. One is always longer. Can anyone provide any clarity in the interpretation of long and short???
Pictorial examples of each (Type 1B & Type 1C) would be really nice.
*** Moved by Staff to a more appropriate forum. ***
The United States Stamp Society's (USSS's) Durland Standard Plate Number Catalog show all four types in color. The 2020 edition has it on page A18. For type one varieties, it references The United States Specialist, November 1972 beginning page 503 for detailed illustrations. For sale here: https://www.ebay.com/itm/U-S-1972-U...353049963196 [ EDIT: Now sold] The lines in question for the varieties were added to both left and right panes of plate 21491 and only the left pane of 21493 during later printings.
The USSS also sells for $12 post paid, The Airmail Special Delivery Stamps Of The United States by Ralph L. Sloat. Sloat was the author of the 1972 article mentioned above. The book includes, "A specialist chart in color shows the various red and blue markings on the plate blocks."
Now on eBay these are Type 1, 2, 3 and 4 plate blocks. There are more than a handful of Type 1b. If you sort the CE2 listing by price, highest to lowest, the types tend to group. I direct your attention to the type 1b examples as they, as a group, display what Scott mentions as the inconsistency of plate wiping and printed ink variations.
As I was preparing the photos I found this I believe is a Type 1A, listed as a 1B in the title. It is the sellers ID "pb2917" in the title.