Hi babysitter,
You can see the difference on the print position of the Treasury Seal.
The seal is closer to the center.
Although the Friedberg catalog makes only a few of difference in the prices, there are more than the few Friedberg examples recognizable on the market.
For example, the $ 20 Series 1914 New York (blue seals) is one of the more expensive ones. Typically, the New York district is mostly less expensive than the most other districts. That's true again in 1914 $ 5 bills, New York is the cheapest district.
Often the C variant is less common than the A variant,
but from the 1914 $ 10 New York bills you can find the C variant more often than the other ones.
Because of the many variants of the 1914 series and also because of the different commonly, are there several differences in price.
I've learned that observe the market is more important than watching the price list in the catalogs.
Catalog prices are only indicative Guidelines.
Signatures are important for me.
The most common and most recent 1914 bills are the Mellon & White signatures which were produced between1921 - 1928.
Burke & Glass notes were 1918 - 1920 produced.
Houston & Burke notes were only produced between 1920 and 1921.
These differences found in the catalog too little observance.
This is true unfortunately also for almost all American bills.
A good example of this nonsense is the $5 1899 Chief.
The Catalog means that all variants are worth the same, with only one exception.
How can a Speelman & White bill be rated like a Lyons & Treat bill?
The Lyons & Treat variant is at least 16 years older and was still about 4.5 years less produced.
Here are some examples where you can see the differences between A, B and C variants.
http://www.banknote.ws/COLLECTION/c.../USA0359.htm( The $5, $10, $20 and the $50 1914 bills are fortunately all my.

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Sorry for my bad english!