My OCD is kicking in while on my quest to catalog all my coins on a spreadsheet (one of the columns on the spreadsheet is "Mint Location"). I purchased several SMS coins (1965-1967) individually. I was under the impression that these coins were minted in Philadelphia since there is no mint mark on them. However I am reading conflicting articles on the internet that these were made in San Francisco without mint marks. So, where were they minted?