I like the card; just wanted to make sure you were reading the
price guide right.
A PSA 5 Sovereign back common currently books in the SMR as $180, without qualifiers.
Yours has a Miscut qualifier which would normally reduce the book value to approximately a PSA 3 at $55. So that's why you got a nicely presenting card for cheaper than you expected. I'm actually surprised it got a MC designation, since I don't see any part of the card that has been cut off, or any part of another card showing. The card is off-center Top-to-Bottom, but the entire black rim of the image is shown. However, they probably kept it as a PSA 5 with qualifier since otherwise it would be a straight 3. A grade of 4 requires 85/15 centering on the front.
http://www.psacard.com/Services/PSAGradingStandards