This is the rule of thumb I see others using if you want it "just so":
1959-Early 1968: Patent Pending (no R)
1968-1972 : Patent Pending R
1973-up service replacement: patent # 276xxx R
I have purchased a couple of NOS caps with "Patent Pending R" for less than $100 each--just keep looking.
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My Wife: "I thought I married a sophisticated business man, but what I actually got was a redneck fisherman with muscle cars."
Some people know all of their rights, but none of their obligations.
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