On Ebay. This looks like some machines in the Crescent/Hobart catalogue Robert posted a while back. I would have to guess it is from the early postwar years or VERY early 50's at the newest. I know we have not seen this model DW before in the time I have been a member.
WK78
http://www.ebay.com/itm/HOBART-PASS...Domain_0&hash=item19f6d21084&autorefresh=true
WK78
http://www.ebay.com/itm/HOBART-PASS...Domain_0&hash=item19f6d21084&autorefresh=true
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