Vintage Jaeger-LeCoultre Tank Moonphase, Pointer Date, Ref. 400.6.20, Two-tone steel/gold case from 1990'sThis Jaeger LeCoultre Tank Moonphase, reference 400. 6. 20, is a great example of the brands creativity during the 1990s. While the Reverso often defines JLCs rectangular legacy, this model takes a different path slimmer, more classical, yet unconventional. What makes this watch particularly interesting is its dial architecture round dial layout set within a rectangular case. The moonphase aperture and pointer date add visual complexity. The case