For anyone looking for a MKII Jet with exotic dial, this one looks amazing (albeit many of the photos are not great, so would like to see some better ones first, but they look better when magnified). The NOS term is heavily overused and largely misunderstood, but this example may be close to it. The serial is not visible in photos but they list it in the details. The price is steep.
Enicar Sherpa Jet NOS Stainless Steel 1960s - Gisbert A. Joseph Watches (joseph-watches.com)
Enicar Sherpa Jet NOS Stainless Steel 1960s - Gisbert A. Joseph Watches (joseph-watches.com)