She's a beauty!I have a near mint red '78.The girlfriend and I ride it several times a week,whatta blast. I'd love to find an older one like yours in that color.I think it's a '74 or '75 based on the color,which looks like "Chestnut" and the tires,they look like 1-3/8"ers,are they? The rear reflector on a '74 is small and round. The '75 has that giant rectangular one like my '78. I cant tell from your pic. which you have.Check the s/n on the head tube.Have fun.
Pat