How to remove a door knob without visible screws

I scratched my head many times trying to figure out how to get the latch and knob apart on this era of door hardware but after an hour of

MYSTERY: Door knob removal mystery! I have a pre-war glass doorknobs with no obvious way to remove it!! (No visible screws or slots, no moveable

remove door knob no screws no slot remove the door knob now the way that is done there's a little tiny slot there can you see that

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