I've done some cursory research on how to read classic Schwinn SNs.. but have not been able to figure it out. Can someone give me some info on the following...?

on the bb shell: Caliente GG814934 or GG314934 (I'm thinking early 80s?)
on the dropout: LeTour SE014127 (I'm thinking mid 70s?)

Any help is appreciated.. THANKS : )