I'm just looking for a second opinion on this Machine Doubled penny.. I know there's legitimate DDOs for this variety.
If the doubling is on the date and mintmark it can not be a DDO. Due to mintmark being placed after the die is made.
After 53 years, VV and Wexler probably list all the known legitimate varieties. Go there to confirm if you suspect doubling…imo…Spark
I've checked CopperCoins.com and there is two variations that have a few matching points that match this one but like the first responder said, none of them have any doubling on the S mint mark.