Contact plating:
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F - gold flash over 50u" nickel G - gold flash over 30u" Pd-Ni over 50u" nickel J - 30u" gold over 50u" nickel
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Shell option:
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T - tin plated N - nickel plated
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Rear shell option:
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0 - without rear shell 1 - with rear shell
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Insulator color option:
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B - black I - ivory W - frost white
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