i have today, discovered that i am totally incorrect in the information i gave about the production period for this watch. i am exactly 100% wrong which is far better than being slightly wrong
the W3818B in fact came out in 1964 and remained the specification for US pilots watches until it was replaced by the GG-W 113 in 1969. so when i stated that it was one of the last, it is in fact one of the first of its production.
sorry guys, i try to research everything i buy, but you cant be right all the time.
best
graham