ahhh a plane
ding ding ding ding! We have a winner!

It's the bottom of a corrugated #3 smoothing plane. It's a three patent date plane, probably made around 1910 or so, and is of a type of cast iron that will break if it's dropped from your workbench onto the surface below. The plane probably won't break if it lands on your toe first, though...
Here's the full size picture:
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-- John





