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The 1500 in the Sams parts list and schematic means MMFD. The header at the beginning of the capacitor section says, "Capacity values given in the rating column are in mfd. for electrolytic and paper capacitors, and in mmfd. for mica and ceramic capacitors."
That value, plus the square shape, tell me this is a mica cap, which I would not replace at this time.
Anything is possible, but in my experience, flat plastic-coated paper caps are rectangular, not square.
Many micas have colored dots, but some do not, and to add to the fun, more than one color coding scheme was used. It's possible that your cap once had colored dots, but the paint flaked off or faded.
I would replace the electrolytic and paper capacitors and worry about this one later.
Phil Nelson
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