I see those about every other weekend at various flea markets.
Seen all makes, Dayton, Thorsens, and Snap on...
I suspect sometime a while back the "I Beam" technology must have a period fad.... (anyone remember the timeframe?)
Another period fad... Woodgrain...
Remember the late 60's early 70's when woodgrain was in... Woodgrain on toolboxes (Craftsman did this, I also have a herbrand toolbox that is almost all woodgrain). Woodgrain in cars (my 1971 Buick GS)... and lets not forget the woodgrain panels in the basement that complimented the green **** carpet.
Back to the Subject... I have all three types of these tools and they do feel solid, but do look a bit dated.. they must not have lasted too long.
-BWP