The subject bicycle looks like one of the dozens of entry level, private brand models offered though hardware, automotive or other chain stores during the early 1970s bicycle boom. The fork blade reflectors were short lived and were popular circa 1972. That particular style is reminiscent of those seen on Bridgestone of the era, though they could be standard items from a 3rd party manufacturer, such as Cat-Eye. The brakes appear to be the ubiquitous Cherry steel centre-pull models from Japan. The derailleurs aren't identifiable but appear to be entry Shimano models, either Lark or Eagle variants. It has a bulge formed head tube and next to no aluminum components. This bicycle was likely sub $100 US when new, placing it near the bottom of the barrel.

There appears to be a country of origin sticker at the bottom of the seat tube. Between that and the serial number we may be able to identify the manufacturer.