Regular strike?

[Popsiclman]

I have a 1957 Philadelphia Mint set, all coins still in the original cellophane. Are these coins considered regular strike coins?
I've also seen proof sets in OGP with the S mintmark and other, raw coins described as "regular strike" coins with an S mint mark. How would I tell the difference?
Thanks!

[occnumis2021]

you are kinda asking a question that has a few answers because you're covering a lot of numismatics with the way you are wording it.

other than sms, patterns, dmpl etc, there is no confusing proof vs business strikes(unless strongly circulated or damaged) and unfortunately, both do contain the S mintmark (other mm on proof&business strike coins may exist).

regular strike = business strikes = intended for circulation/commerce

proof strike = intended to be collected

there are proof like business strikes that can be a bit tricky sometimes but those are exceptions.

really it is best to do a case-by-case.

[Popsiclman]

Still a little confused but thank you. I appreciate it!

[occnumis2021]

not that it is related to your inquiry but i will add this addendum about there being no confusing business strikes vs proofs: proof dies were "often" used afterwards for business strikes and has caused great confusion and study but really isn't much related to lincolns and such, mostly 1800s coinage with some exceptions of course.

after rereading your inquiry, "I've also seen proof sets in OGP with the S mintmark and other, raw coins described as "regular strike" coins with an S mint mark."

if you put a proof coin next to a business strike one, 99.9% of the time there should be no confusion as they are JUST that different in appearance.

[MintErrors]

I have a 1957 Philadelphia Mint set, all coins still in the original cellophane. Are these coins considered regular strike coins?
I've also seen proof sets in OGP with the S mintmark and other, raw coins described as "regular strike" coins with an S mint mark. How would I tell the difference?
Thanks!

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You mentioned Mint Set, if it is a mint set, they are all business strikes, not proofs.
Proofs were issued in an envelope, a separate purchase, typically one type coin (1c, 5c, 10c,25c.50c) in a single cello.
The Proofs are typically very shiny, so much so that in a reflecting light, it should almost blind you. That effect can be dulled down if the coins have toning or are really milky looking.

S mint marks can be a bit tricky to understand, BUT, there are a few years in the 1960's that there was a S business strike and a S proof. Google knows all.