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I have no idea. Even if it was a larger compound back then, it still would have made an effective abrasive for keeping the razor sharp. It was embedded in paint, not bare abrasive particles like we...

They had chrome oxide too - it was the coloring agent in green paint. My great grandfather had a "green-painted board" that he used to strop his razor on.

Ack!!!!!! The thumbnail test should never be done once the razor has left the 4k hone (or the belgian blue or whatever you're using to set the bevel)! The edge is far too delicate to survive such...

Once you've got a flat hone that's often what it means. But if the hone isn't flat you can get odd bevels too.

Lapping is flattening the hone. I use a sheet of 600 grit wet/dry sandpaper on a flat surface. Mark a grid on the stone with a pencil, then soak the hone and wet the sandpaper and swirl it around...

Did you lap your norton before trying to use it?

Uneven in what way?