Posted this on another major Stamp Collecting forum but since I'm so enamored with this cover I thought I might share it here as well.

C4-6 on Registered Cover to Amsterdam from Portland Oregon franked on the back 1924. Did not travel by air as the first Trans-Atlantic Airmail Service was not established until 1929 if I recall correctly. Some toning and stains on the cover, some spotting on the stamps, but condition aside - I was drawn to the neat alignment of the stamps and the beautifully scripted address so a real "eye catcher" to me.
Now for my question: when I first purchased this cover I was somewhat skeptical about its authenticity (I'm not sure why, I think I'm just a natural skeptic) so I went online trying to research historical international letter rates. After some frustration and many search queries I was only able to come up with historical
domestic letter rates. Although my skepticism has now subsided and I not longer think that the cover is a clever forgery (the nominal value should have been my first clue!) I'm still curious to find a table with such information. Basically: I'm interested in finding out out what the actual registered rate to Holland was at the time.
Thanks for looking!
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Thanks! I moved the photo to a different album and think this might have broken the link - hopefully it works now.