Nice covers.
The date looks like 9/10/23 (if I read the date and chart correctly)would be the day before it jumped to 2m Marks.
As bob said, his was the last day before it jumped from 40
Billion Marks to 80
Billion Marks.
Thanks for showing,
Pat
https://www.stamp-collecting-world...._hyperb.html(from the article)
The 1923 postal rate table, for domestic / foreign letters under 20 grams, is shown below. By October of 1923, 2,000,000 Marks wasn't even enough to mail a single domestic letter, thus by that time, most of the re-valued stamps, shown in the images above, were all useless.
Letter Postage Rates for 1923
For Domestic / Foreign Letters, Less than 20 Grams
1923-JAN-15 -- 20 Marks / 150 Marks
1923-MAR-01 -- 40 Marks / 300 Marks
1923-JUL-01 -- 120 Marks / 800 Marks
1923-AUG-01 -- 400 Marks / 3,000 Marks
1923-AUG-24 -- 8,000 Marks / 60,000 Marks
1923-SEP-01 -- 30,000 Marks / 200,000 Marks
1923-SEP-20 -- 100,000 Marks / 750,000 Marks
1923-OCT-01 -- 800,000 Marks / 6,000,000 Marks
1923-OCT-10 -- 2,000,000 Marks / 15,000,000 Marks
1923-OCT-20 -- 4,000,000 Marks / 30,000,000 Marks
1923-NOV-01 -- 40,000,000 Marks / 200,000,000 Marks
1923-NOV-05 -- 500,000,000 Marks / 4,000,000,000 Marks
1923-NOV-12 -- 5,000,000,000 Marks / 40,000,000,000 Marks
1923-NOV-20 -- 10,000,000,000 Marks / 80,000,000,000 Marks
1923-NOV-26 -- 40,000,000,000 Marks / 320,000,000,000 Marks
1923-DEC-12 -- 50,000,000,000 Marks / 300,000,000,000 Marks