Thanks Skylark. Given that the US civil war ended about a century before, the anti-Yankee sentiment south of the old Mason-Dixon line appeared to still be at full strength in the 1960s. Fancy producing a special model for southern buyers, complete with a Confederate flag decal - that's the UNITED States of America for you! I've also posted the advert below which you can just click on to see in full. It's a real time capsule.