Picked this up today to fill my 79s type II spot. But after taking a closer look once I got home, looks flat like the 81s type II?
You know....after looking on http://www.lincolncentresource.com/San_Fransisco_Mintmark_Styles.html ,I believe it's a 79s type II. Sorry for jumping the gun.
It's been a long time for me. I'm thinking the type II S in 1979 became the type I in 1981. Is that correct?
Correct. The OP's coin has a type II Mint mark from 1979. The 81 type to mark has a less symmetrical S with one loop larger than the other