Well Hobo, like yourself, I have now cut cut apart one of each---that's epoxy resin & "tar".
The big difference I'm noting is that the resin model (left in photo) weighs in at 5 oz, whereas the "tar" model (right)weighs in at 8 ounces. Both of these windings came out around 95% complete, so I think the listed weights are fair.
Both coils were sold to me as though they were identical 6V 9N. Obviously there is really a huge difference that would not ever be noticed, in normal conditions. The 8oz. "tar model" is 60% larger than the "epoxy resin model", and that variation combines with a huge difference in packing material.
Not knowing any better, when I started in on the "tar model", I thought "dang, this sucker is really burned up"!
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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