Hehe. Well, we all know a bit about Momotaro here. Toghether we know it all

Arcs as seen on the BOM4 are normally only seen on Euro Label and Copper Label. Grand Indigo is part of Euro Label.
Euro Label sports tab and arcuate, while Copper Label only features the arcuate. Male models on Copper Label line feature the riveted leather patch, women models don't. Vintage Label features only tab, just like GTB (along with the battlestripes offcourse). Not even mentioning the 0202 and 0702... Those lack tab, arcs and GTB stripes.
Does it make sense? No, not really.