Lucky you! I see that you're the one who was advertising for just such a bike in the "Frame doesn't Fit" thread. Nice that you also found one with the Schwinn Approved (Suntour) barcons.
One note of caution in reference to dating these with the serial number. They made a TON of '73 dated frames, outfitted and sold years later. I've got a couple with colors that were only offered in '75, but they have '73 serial numbers. Component dates and some parts variations will help you nail it down a bit more. The particular model of skip-tooth freewheel is one of the things to look at.
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"My only true wisdom is in knowing I have none" -Socrates