I know that this is the NSF 53 quarter. Beyond that, no idea. For some weird reason, I had it in my head that the RCM didn't make PLs until the 60s? But, here we are... I don't know what the difference is between PL and SP; nor the 'small date/large date'. I know what the abbreviations mean (PL/SP), but I don't know what the difference is, physically?
Perhaps someone would be kind enough to enlighten me about what I have here -- Or even if it's simply a very mirror-like UNC/BU regular strike.
As always, very much appreciated.
Cheers.
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