China Overprints Or Inflations I Need Help On Please Help #3

Not sure exactly what I have are these over prints or inflation stamps? Looking for more information on them and potential value. I have several of these. But will only post a few at a time. Thanks!

WWII ended by US dropping two A-bombs in Japan and the Japanese Empire surrendered on Sept 2, 1945. The inflation in China started right after the War in early October. A domestic 20g letter fee was 20 Yuan on Oct 1, 1945. By June 21, 1948, the same 2g letter required 15,000 Yuan to be mailed. The Kuomingtung government changed the National Currency to Gold Yuan in August 1948 with the exchange rate 1 Gold Yuan = 3 milliom CNC (Chinese National Currency)and the same 20g letter fee went down to 10 Cents on Nov 19, 1948. This did not stop the inflation. The 20 letter quickly went up to 1500 Gold Yuan (GY). The Chinese Kuomingtung government under Chinag Kai-shek again changed the currency from GY to Silver Yuan where 1 Silver Yuan = 500 milliom GY in July 1949. The 20g letter fee dropped down to 4 cents on April 27, 1948. Then, by September, the Chiang Kai-shek regime losst the entire mainland to the Mao communist regime. Therefore, any Chinese stamp falls within this period time are considered inflationary issues, regardless its denominations. This is a very interesting historical period to collect especially the covers.

Row 1 Revaluation surcharge May-Aug 1948 SG1007
Row 2 Stamp 1 Gold Yuan surcharge Oct 1948 SG1079 or SG1080
Row 2 Stamp 2 This is not overprinted. It is the standard 1934 Martyrs of the Revolution issue.

Great history on this! Thank you so much!