Position of the VIN plate suggests it is not from USA. Although as you say it has US style indicators. F1 had gators on fork legs, F2 none.
Strange as my USA F VIN is a much higher number but marked as manufactured in June 1975. CB500F-2008995. But my engine is a lower number than yours, begins with a 1. I thought only the later Ks had engines beginning with a 2. The plot thickens. Mine is also shiny orange that I believed was an F1 colour.
Yours does look good.