Not much help, but I have seen covers around 1950 using the .15 upu (Scott C35) stamp to Germany, but I am not sure if they were 1/2 or 1 oz. I looked for a link but could not find one. I am sure someone on here can help.
"Does anyone have a link that details air mail rates from the US to Foreign destinations from its origins to today? "
US Postal International Postal Rates, 1872-1996 by Anthony Wawrukiewicz and Henry Beecher is what you need. Addenda and corrections are posted to a web site for book owners to utilize. Check eBay and Amazon for a copy. Good luck finding a copy for less than $75. You may also be able to check out a copy from APRL from time to time.
"I am currently interested in what the air mail rate would have been for a 1 oz letter from California to Germany in 1950?"
Airmail rates are very complicated early on, but by 1950 they are fairly simple. From 11-1-46 to 6-30-61, anywhere in US to anywhere in Europe was 15c PER HALF OUNCE.
Lars
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"Expanding your knowledge faster than your collection can save you a few bucks."
Lars nailed both the specifics and the general. If you want to understand US international airmail rates, you need the W&B book. It is an essential starting point. It also includes lots of other rates, and it's well organized, illustrated, and worth every penny. Unfortunately, there is NO secondary market; all books are kept forever, and, as there is no revised edition, no outdated editions to be had.
There is no book I reference more than this and its domestic companion.
David
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"Save the USPS, buy stamps; save the hobby, use commemoratives"
Philatelic Bibliopole, a philatelic bookstore operating out of Louisville, has an excellent selection of publications (including out-of-print) on postal rates:
I recently purchased the latest edition of the "W&B book" (U.S. Domestic Postal Rates, 1872-2011, 3rd Ed., by H.W. Beecher and A.S. Wawrukiewicz) from them.
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