Copyright Variations
Can any of you advanced W572 collectors verify the various number of copyright variations? I have seen four variations:
1) The easy to find 'S' which is preceded by the copyright symbol containing an "I" and an "F" within the copyright circle. What does the "S" or "IFS" stand for?
2) "U+U", which I presume is Underwood & Underwood
3) "FM", which I presume is Felix Mendelsohn.
4) "P+A, which I do not know what it stands for. Does anyone?
Are there more?
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