Obverse Dies: 4 Known
1850 New Orleans dimes are found with three mintmark sizes: Small, Medium and Large. Four obverse dies are paired with three Large O and one each Medium and Small O reverse dies. Mint State 1850-O dimes are considered R7 rarity regardless of mintmark size.
Plate Coin: Fortin 101, Fully struck and near continuous luster with few marks, a filler in PCGS registry set as primary example remains as NGC MS67 Star example.