1970s Jaeger-LeCoultre Tank Hobnail Ultra-Thin 18k Yellow Gold 4427A stunning in absolute perfect condition 1970s Jaeger LeCoultre Tank Hobnail Ultra Thin in textured finish Clous de Paris 18k yellow gold. This example comes with a no lume Clous de Paris gold dial and matching thin no lume hands. The watch is in superb condition, showing only light signs of wear or minor scratches, which are to be expected for a piece of its age. The Jaeger LeCoultre Tank Hobnail Ultra Thin Ref. 4427, produced during the 1970s, is a