This is the thread you want:
https://www.bikeforums.net/classic-v...-3-speeds.html
Regarding your bike, it has the fairly rare 23" ladies' frame. Taller riders like 'em. I have one just like it, waiting in the wings for the day when I can no longer swing a leg over my men's 23" Sports but still want to ride.
Look on the rear hub shell for a date code; a '71 will have a year followed by a month, like 71 (big space) 6 for June of the year. Normal to assume the bike was built shortly after the hub was.
It looks like you have a shop sticker on the seat tube. You might want to post a pic of it in the Shop Stickers thread.
