I've never seen an international that old so I find that very interesting. I have a couple question to further my knowledge of the model. Do you know the year? Is it high tensile steel or chromoly? Are the dropouts stamped or forged? I assume they are stamped but from the pic it almost look like they are forged. Anyway, nice work on all three.
I had a Nishiki International that I purchased new in the spring of 1973. It MAY have been a leftover 72 model, maybe not, but the year before whatever mine happened to be was the last for the Kokusai name. Part of the transition from American Eagle to Nishiki, I guess.
Mine also had that heart shaped braze on below the cable stop on the downtube. It also had a Chrome Molybdenum frame (that is all the decal said), stamped dropouts that look more like forged than most do, Suntour VGT derailleur with stem mounted Power Shifters. I rode the hell out of that bike from age 15 to 16, about 3500 miles worth.
Many, many happy memories on that bike!