next steps to define the groups

Now that I have typed the first four groups, I plan to type all of the remaining groups up to 1944:

5. The 1p without boundaries 1E1 and 1E2.
6. The Departmental Officials and 'Servicio Oficial' issues for the 1p without boundaries.
7. The typographed issues of 1937 and onwards on the 1E1 paper: 1c, 5c, and 10c last plate.
8. The Departmental Officials and 'Servicio Oficial' issues for group 7.
9. The 1E2 issues. Because I only find the 1/2c for the small format issues, I am grouping the entire range here for this paper (1/2c to 20p).
10. The Departmental Officials and 'Servicio Oficial' issues for group 9.
11. The 1939 clay paper issues for the 5c and 10c Brown.
12. The 'Servicio Oficial' issues for group 9.
13. The 1939 color changes for the "cents" issues and all small format on the 1E3 paper.
14. The 'Servicio Oficial' issues for group 13.
15. The 25c to 20 pesos issues on the 1E3 paper.
16. The 'Servicio Oficial' issues for group 15.
17. The 15c Martin Guemes and the 20c Large Format cattle on the 1E3 paper from 1942, including the 15cMG 'Servicio Oficial.'
18. The 1942 issues on the 1E4 paper from 1/2c to 20 pesos.
19. The 'Servicio Oficial' issues for group 18.
20. The 1943 clay paper issues 5c/10c and large format stamps.
21. The 'Servicio Oficial' issues for group 20.
22. The second watermark issues from before 1945: at least I know about the 20cLC for these (2N paper).
23. Are there 'Servicio Oficial' issues for group 22?