I've completed 3 sets of Jefferson nickels
out of circulation (coin roll hunting) in the past five years and four sets in my lifetime.
There are few Jefferson nickels
that are tough to find, but the 1950-D might be the toughest. Tough, but not impossible. Many have been found and reported here on CCF.
Yup. 1939-D (3) and 1950-D (4) have been my toughest in approximately 1.375 million coins searched. The only other coin not to get to double-digits is the 1938-D (8).
Also, for those not in the know, the 2009 coins are tough to find for most of us, particularly the 2009-P. I've only found 99 examples to date.
CRH Nickeloholic. 1,300,000 nickels searched in five years! Already have found THREE complete Jefferson sets!