Denver, CO
The letter "D" is the mint mark for the US Mint in Denver, Colorado.
The D mint mark on any coin minted since 1906 indicates it was made at the Denver Mint.
First off, the "D" is for the Denver Mint. It depends on the condition that its in. Average Circulated........$0.60 Fine...............................$0.65 Uncirculated-60.............$4.75
1950 Australia - definitives - Aborigine 8½d - brown (vertical) Mint UnHinged = $0.70 AUD Fine Used = $0.40 AUD This is similar to the 8½d stamp, but larger. 1950 Australia - definitives - Aborigine 2/6d - brown (vertical) Mint UnHinged = $4.00 AUD Fine Used = $0.60 AUD
it does not have one.
Their are a few answers. For pennies no mint mark means Philadelphia or for proof pennies which are only in proof sets S means San Francisco.
The only mint marks on a 1952 dime would be an "S" for San Francisco and a "D" for Denver. Please examine the mint mark on your coin again since some are not stamped clearly or have some sort of damage from being in circulation.
I think it is Franklin Mint
The only US coins to carry a C mintmark were gold coins struck at the Charlotte Mint from 1838 to 1861. The mint mark position on a 1950 dime is on the back at the bottom of the torch: No mint mark = Philadelphia D = Denver S = San Francisco There's more information at the Related Question.
You have a very well known variety of a repunched mint mark.The most dramatic is a solid D above a faint or shadow like D below and if the 2 D's don't touch each other The value list as fallows in VF-20 $10.00 EF-40 $25.00 AU$30.00 MS-63 $35.00
HAWAII-stamped bills were issued for use during WWII so any bill dated 1950 wouldn't be genuine.
A second mint mark that far from the original mark sounds like one that may have been added after the coin left the mint. There was a time at the mint when the mint workers would take a punch with the mint mark on it and punch the mark on the die. This allowed for mint marks that were tilted, off center and even doubled if the punch bounced when struck with the hammer. However, this practice ended in 1990 when the mint marks were placed on the master hubs and no longer punched by hand.