In the mid 70s, many bikes of different brands had those components. Weinmann brakes (centerpulls were higher quality than sidepulls then) were very common, as were Suntour derailleurs. These weren't bottom of the line bikes, but one or two models up from the bottom and pretty reasonable quality for the time. These components were pretty standard on bikes in the $125-$150 price range, or perhaps even an entry-level racing bike of around $200. There were quite a few Italian brands then, so it may be impossible to be sure which unless you can find a decal. 6360 was a grade of steel tubing, I believe, used on something similar to a Raleigh Gran Prix. What is the weight of this bike? What is the crankset? Cottered or cotterless? Freewheel brand and tooth range? The Suntour-V handled a narrow range, so I'd guess maybe a 14-24 freewheel. I worked in a bike shop when these things were on the market, and we sold Raleigh, Motobecane, Peugeot, and occassionally some odd Italian brands. With photos of components I might be able to provide a bit more info, but probably can't id the bike.