This is an older thread but I will add another point of reference to dating a Wisner Technical Field.
I bought a Wisner Technical Field serial #375 from Lee in 2006/2007. It had the solid brass tripod plate with both 1/4" and 3/8" threaded openings.
I emailed Ron Wisner at the time on dating my camera and received this reply: "Your camera dates from about 1989".
I think #375 dates from the early 1980's but additions to this thread would be welcome to begin adding more Wisner serial numbers and dates.
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