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I think if that little washer were somehow connected to the grip screws or escutcheons, there should be some multiple of four of them. I'm betting it's a stray from something else, even if it found its way into the gun before you acquired it.
My favorite gun oil is Mobil 1 5W-20. You can get a whole quart for less than what you would pay for an ounce of some fancy "gun oil" that probably doesn't work as well anyway. And yes, absolutely lube all of those internal parts before reassembly.
A Series 80 Gold Cup, while a really nice firearm, is anything but "collectable". Do what you like with it. They are literally "a dime a dozen" and hold no interest with Colt collectors. As a matter of fact, the Series 80 is held in the same high esteem amongst Colt collectors as mid-year 911's are seen in our circles. A blank canvas upon which you can let your imagination run wild. No one will get upset with you.
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Jeff
'72 911T 3.0 MFI
'93 Ducati 900 Super Sport
"God invented whiskey so the Irish wouldn't rule the world"
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