Rodney,
Like this rebuilt Singer 66-1 that I have:
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Front view, you can the Revco Reverser, aftermarket presser foot adjuster, Mercury Electric type foot controller, Aftermarket electric motor hand wheel. Also the replacement side clamp presser foot shaft and aftermarket Singer placard. This machine has a second rate paint job and still retains its original Singer badge.
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Back view, you can see the aftermarket AC DELCO motor, and Leviathan aftermarket light.
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Rebuilders tag on right side base of the pillar.
Not shown in these pics is the reproduction slide plate installed to replace the missing original.
Joe