I Need Some Help Figuring Out What These Greek(?) Bills Are

Sorry, the sources: https://collections.ushmm.org/searc...og/irn524915 & https://coinmill.com/GRD_USD.html#GRD=25,000,000

Looks like you might have a 1944 1M Drachmai (P149). I think in that condition US $40-60 is probably reasonable but I am no expert. Really cool.

edit: Defering to walk2dwater's expertise here.

- the first thing you want to do is IDENTIFY your note. Use the bank note museum (or Banknote Index/ Numista, etc).
http://www.banknote.ws/COLLECTION/c.../GRC/GRC.htm
There are plenty of sites out there now (including my hobby site below which I dedicate to new, PT & seasoned collectors).

The 2nd thing you can do is to check ebay (or some other auction platform).
You can "SEARCH" the country name & code (P-127).
Here's 7 results which range from $2.99 USD to 50€
https://www.ebay.com/sch/i.html?_nk...127&_sacat=0

The 3rd thing (which is probably the most neglected) is to EDUCATE yourself (which you are doing ) & continue investigating. There may be short prefixes, design variations & all sorts of surprises. That's why collecting world bank notes can be so enjoyable (if you continue to tune in & do a bit of digging). Good luck & keep asking questions!
Notaphylic Culture:
https://sites.google.com/view/notap...ng-banknotes

As others noted, there were three "Greek Drachma" currencies. The second drachma replaced the first after liberation from Nazi occupation, at a rate of 50 billion to 1. The third drachma replaced the second at a rate of 1000 to 1.

The 25 million drachma note is Nazi-issued, from the "first drachma". So it's theoretical "face value" converted to "modern" or third drachmai would be 0.0000005 drachmai, or a tiny fraction of 1 eurocent. Entirely theoretical, as Nazi-era and earlier notes were all demonetized.

Of course, it's worth far more as a "collectable note", even if its only worth a few dollars.