John, the Blue Book of Gun Values, 2012, 33rd edition, p. 1428 provides percent multipliers for SST, Vent rib and other features. P. 1428 gives a $70,000 value for a 99% D grade 410 , with an add on of 25% to 50% for ejectors.
I am aware that some Parkers are going for large sums, and there is significant money available for high collector quality gun investments. I have little doubt that we will see more Parkers in the $200, 000 to $300, 000 range in the not too distant future, if what I hear is true. Those guns that reach those high levels are subject to extreme scrutiny.
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