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					Originally Posted by David Noble  Not only is it a lifter, but also a pin lifter with pin protruding from the top when opened. That feature was phased out pretty early in production. I have serial number 3402 and the pin hole is plugged, so it doesn't raise above the top.That is a very nice graded lifter!
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 Dave, I have a #3700 range gun that looks the same but the "pin" that comes out the top of earlier guns is just a plug that doesn't move up when the lifter is depressed like my #1700 range gun does. I assume they kept using the original frames after they made the minor modification to the lifter mechanism and just plugged the hole. 
As an edit, I now see a couple photos that appear to show the pin extended out the top of the action.
That is a beautiful high grade gun.