K 61 7.92 - British Tracer, probably for export with the caliber at the bottom of the headstamp.
P635 - You could call that from “Nazi Germany” but it is actually made in Austria, by Hirtenberg. I forget exactly when Germany and Austria (and perhaps the Sudetenland) became “Gross Deutschland” or “Greater Germany.”
RWS E37 - sS ball, for export. I am tempted to ascribe the letter “E” in the headstamp to “España,” but all the boxes I have seen that held these rounds were from Portugal.
The one with the little sunburst insignia is Chinese.
The “D” headstamped German WWI cartridge is from the Kõniglich Sächsische Munitionsfabrik Dresden, with the “E16” indicating a steel case made in 1916.
The “S” I believe stands for the “S Case” which is 7.9 x 57 Mauser.
19 / Z / 40 / V is Waffenwerk Brünn, Werk Povazska Bystrica, from Czechoslovakia, case made in 5th Month of 1940. The green seal indicates it is type sS ball. They were simultaneously making type S and type SS ball in those days.
K DWM K J - is an export cartridge from Deutsche Waffen- und Munitionsfabriken A.-G., Werk Karlsruhe. Much of this ammo went to Spain and Portugal, I think. It is definitely found in Portuguese boxes properly labeled.