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PanCanal,
Your summation is entirely correct. No Pat. Pend. markings is the first variation, then the Pat. Pend. marked blades, then the Patent information forged into the fuller.
Ebay sellers often refer to the Pat. Pend. model as pre-patent. I've tried to inform sellers of their mistakes in the past but have pretty much given up on that. Most people don't want to hear what your telling them and are down right nasty about it.
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