I think part of the problem creating disparity here lays with gold coin terminology and definition of same..
By 1933 is it really fair / correct to consider / define minted gold as "for circulation..?"
I was of the belief that for coinage / paper to be considered "for circulation," one could walk into a bank, or anyplace for that matter, and stand as equal a chance at receiving gold back as paper money..
In actuality though, when did banks stop "giving out" gold in any manner other than "on demand..?" Or further: When did the 'last' bank stop returning gold as a portion of your "change for a hundred" without being specifically requested to do so..? I'm fairly certain it was at least a bit prior to 1933..
I'm thinking at some point-in-time revolving around the last bank returning gold to you unrequested and the last person spending gold out-of-pocket for goods or a service the portion of the definition defining newly minted gold coinage as "for circulation" should have been changed to "fill in the blank," since for all intent and purpose gold coinage had already made the transition to collector status..
Swamp