OK, let me be the first to answer although there are guys here with MUCH more knowledge on Fujinon lenses.
To start with - the Fujinon lenses are great and on pair with Shneider or Rodenstock. Indeed - they are not so well know and tend to fetch lower prices on the used market.
You are right - a serious collection of age versus serial numbers is missing - the best to my knowledge is to be found on
Kerry Thalmann web page . Kerry has much more information about different lenses on his webpage - have a look around.
The largest (to my knowledge) collection of information on Fujinon lenes is
HERE.
In short to answer your question about SW ans SWD fujinon lenses. SW lenses are f8 versions and SWD are f5.6 version. They have different optical design. Also SWD have larger coverage.
Do not overlook in the second link the fact how to recognize the single and multicoated leses. Singlecoated are usually mounted in Seiko shutters and the lens data are marked inside the filter thread. On the other hand the muticoated versions are usually mounted in Copal shutters and marked form outside on the lens barrel.
And a last comment - although different lenses can and do differ in their performance, there are no "dogs" among lenses, only among photographers
God luck with your 65 - I think most of the people will confirm for yu that it is a fine lens. You want the SWD as it covers 177mm in comparison to SW (155mm).
Matus
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