[First Text then eye candy below.]
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Recently I stumbled across PSE certs for these two stamps that, at first, puzzled me. The QE4 was described as having been issued in 1929 (think this should be 1928) and yellow green in color ... QE4a was described as having been issued in 1925 and deep green in color. Which, of course, is just the opposite of what I find in my 2017 Scott specialized. The two certs were dated 2005 & 2006. My assumption, for now, is that these two numbers were swapped sometime between 2006 & 2017. Can anyone confirm this? I no longer have any catalogue earlier than the 2017.
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Peter: Thanks, you've confirmed my hunch that Scott renumbered these to place the catalogue numbers in the same sequence as their issue dates.
The QE 25 cent deep green came out in 1925 and was Scott numbered. The other three values came out in 1928 along with the yellow green 25 cent.
Scott changed their numbering system to the current model with QE for Special Handling. Per their convention of a "series" of stamps, they listed the values low to high, 1 being the 10 cent, 4 being the 25 cent and chose to list all of the 1928 issues in order and for what ever reason assigned the 1925 first printed 25 cent dark green as a variety (a) of the listed 1928 QE4 yellow green so the first printing in 1925 was labeled QE4a. I believe that was an editorial decision to group the same yellow green colors together, allowing one color title for the group.
Later as the wet/dry and special paper printing were understood, Scott with the help of Bob Rufe redid the QE listings to add missing details and did then switch the QE4/QE4a listing and only those listing to conform with the dates of issue, 1925 then 1928. Scott did not Change the low to high denomination ranking thus the first issued 1925 standalone 25 cent dark green is still listed after the first thee 1928 new values, 10, 15 and 20.
Furthermore, the yellow green and last 25 cent press run started January 14, 1928 and was completed January 19, 1928. This was more than 5 months before the other three values when to press as yellow green on June 22, 1928.
Here are the press dates and impressions for the 25 cent plates. 1925 is all dark green, 1928 is all yellow green. These are taken from BIA Research Paper 6***, the press dates and impression quantities of E, Q, JQ, F and QE. As the organization changed its name afterwards to USSS, it is now USSS research paper 6, no longer available as a hard copy but as an e-version from USSS.
25˘........................17095............17096.........17097............17098
4-4 to 4-16-25.....................................................x...................x............17850 impressions
4-9 to 4-16-25..........x....................x....................................................... 8400 impressions
1-14 to 1-19-28........x....................x...................x................... x ............3500 impressions
Impressions..........11900..........11900............21350.......... 21350
............................17099................17101..........17102.............17103
4-4 to 4-16-25..........x...................................................................x
4-9 to 4-16-25....................................x..................x
Impressions........17850..................8400...........8400................7850
Plates went to press in these sets, Dark Green
4-4 to 4-16-25 17097 17098 17099 17103 17850 imp
4-9 to 4-16-25 17095 17096 17101 17102 8400 imp
Yellow Green
1-14 to 1-19-28 17095 17096 17097 17098 3500 imp
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QE1 thru QE3 are listed as being the 1928 printing and QE1a thru QE3a as the 1955 printing.
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2014 Scott US Specialized, page 403
QE3: June 25, 1928, wet printing, yellow-green
QE3a: 1955, dry printing, yellow-green
QE4: April 11, 1925, deep green
QE4a: 1928, yellow-green
====================
2020 Scott US Specialized, page 450
QE3: 1940 wet printing, green
QE3a: 1955, dry printing, light green
QE3b: 1928, special booklet paper, yellow green
QE4: April 11, 192, deep green
QE4a: 1928, yellow-green
Scott is taking liberties. Here are the denominations and dates of standalone press runs for the other three denomination after 1928 (Note all press runs after October 1954 are Dry Printings):
10 cent:11-26 to 11-28-41
8-6 to 8-12-42
8-26 to 8-28-43
8-21 to 8-24-44
7-31 to 8-5-46
3-8 to 3-10-48
7-26 to 7-28-49
9-22 to 9-25-50
2-7 to 2-8-52
3-6 to 3-10-52
5-18 to 5-19-53
2-26 to 3-2-54
V V V------------V V V-----Dry Printings...V V V.....
11-4 to 11-9-54
8-23 to 8-26-55
9-19 to 10-10-55
9-19 to 10-12-55
15 cent:11-27 to 11-28-41
8-6 to 8-11-42
8-26 to 8-31-93
8-22 to 8-29-44
7-31 to 8-6-46
9-7 to 9-10-48
7-26 to 8-2-49
8-7 to 8-11-52
8-17 to 8-18-53
10-12 to 10-18-54
V V V------------V V V-----Dry Printings...V V V.....
11-4 to 11-9-54
10-6 to 10-10-55
20 cent:7-29 to 8-2-40
11-28 to 12-3-41
8-5 to 8-10-42
8-30 to 9-2-43
8-22 to 8-29-44
7-31 to 8-8-46
7-26 to 8-3-49
8-17 to 8-?-53
10-12 to 10-19-54
V V V------------V V V-----Dry Printings...V V V.....
11-9 to 11-10-54
10-6 to 10-11-55
***
True title as first published:B. I. A. Research Paper
# 6
Printing History of Special Delivery, Parcel Post,
Parcel Post Due, Special Handling, Registration,
Official Mail and Postal Savings Flat Plates
Here is the promised eye candy:

