I picked this up from a roadside rubbish collection in my neighbourhood and, aside from the Sakae stem, Sugino crank and Diacompe brakes, has no frame identification. It's old, but still has 700C wheel sizing. It's even relatively light. I have turned it into a single-speed runaround (the derailleur is Suntour Seven) because I didn't need all the gears and the probably rebuild.
Anyone identify the frame?
Many thanks - Neil, Perth, Western Australia

PS: neat brake adjuster on the front calipers will centre the brake pads.
PSS: So much yellow paint (courtesy of the previous owner) has obliterated any frame numbers, though there appears to be a raised three-number ID on the underside of the crank.