A few thoughts from me as it appears this thread has run it's natural course .....
First of all ..... I do not claim with certainty that the Top-10 stated above is in the exact proper order ...... I still have a problem with the hoarding of the 50-D that I have not solved ......
However ..... I am quite confident in the overall Top-10 listing ..... the original mintage figures are deceiving as they do not account for obsolescence ..... So I remain confident that these are indeed (by my data) the most difficult Jefferson's to find in circulation today.
Kudos to those who have found most of them ..... and I expect most dedicated nickel roll searchers could look at their findings and agree that my 'list' of Top-10 are more reflective of today's reality than original mintage figures ........
It's all due to Circulation Obsolescence.

A few replies if I may ....
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For the most part it looks my find rates are trending nicely to your top ten. I've copied your numbers below then compared them to my inventory through 62,720 searched nickels.
I should have posted that data as well mrak ..... thanks for the suggestion!
I am now at 142,800 nickels searched ..... and my humble tally versus the Top-10 is as follows ...
43-D @ 188,308 - 0
44-S @ 133,385 - 1
44-D @ 89,199 - 0
42-S @ 87,572 - 1
39-D @ 85,494 - 1
45-D @ 71,449 - 1
38-S @ 72,982 - 0
50-D @ 70,406 - 1
38-D @ 55,412 - 2
45-S @ 48,915 - 4
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I've always said Obsessive Compulsive Disorders are not a bad thing, as long as it doesn't interfere with basic life functions.
No worries eaglefoot ........ I am good so far ... but thanks for the reminder!
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I've been thinking a lot about these numbers and trying to reconcile them with what I saw when I was doing it back around 1974- '77. At that time it seemed a lot of the pre-1950 nickels didn't circulate well. It seemed they were being hoarded a lot. Observations since then have implied this even more strongly.
These coins still do not circulate well cladking ..... perhaps we are not speaking the same language ..... but I used my database tonight to address this question for you .....
What percentage of the Pre-1950 Jefferson's have been lost in cirulation in today?The answer is 87.15% have been 'lost' ..... I can share the math if you wish ...... but that seems to me to be sufficient evidence that the pre-1950 Jefferson are scarce in relative terms to find today.
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Well I've blown the odds out of the water!
Indeed you have ...... send a few my way if you don't mind!
Puns aside ..... it's the nature of statistics to have a few outliers ...... all these 'predicted average' numbers are long term averages ..... so you Mr. DylansDad are beating the odds ..... for now.

Well .... it's time to sign off so I can go to work tomorrow .....
I hope to someday write a published article in a national magazine on this concept of Obsolescence ....... so please do not beat me to the punch with my own data.
Enjoy
David