I replied in your other post on this coin. There is no extras value for mintmark location. Until sometime in the 1980's each die had the mintmark applied individually and the location varied greatly.
Have to agree with l. Cutler.
They are interesting the first time we notice they are out of the "normal" position during our searches, but it doesn't add extra value.
Unlike many GM cars, trucks, SUV's and vans...one would love to purchase coins that were minted on Mondays and Fridays as most Errors and Varieties are struck on these days. Yep, it is likely that many Mint employees like GM employees are hungover on Mondays and on Fridays, they can't wait to get off and start their weekend drinking.