Longines Ultra-chron 8472 / 8228 automatic 1970's

Rare all stainless steel Longines with automatic Ultra-chron high precision movement. Perfect working condition, received service a few years ago, not worn since. On new rally strap with stainless steel folding clasp. Case measures41mm wide including the original signed crown. There are only small signs of use and age. No box, no papers. Number found in the case back is 8472-1 but these watches were also offered under the 8228 reference, see picture with Longines catalog page.