There is no " 'late' bone charcoal work" on Parker Guns. The receiver colors are either original Meriden bone charcoal case colors, done the exact same way (dry powder packing and firing in a furnace) throughout the life of the Meriden Parker Gun, or cyanide immersion bath colors (as opposed to dip bath as on the very earliest Perazzi guns imported into the US by Ithaca in the early 1970s). The immersion bath process gives the array and distribution of colors exactly like Brian's post beautifully shows as opposed to the "tiger stripe" distribution of colors that Bruce Day's post alludes to.
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