The little brass stove on the left is a SVEA 123. I bought one back around 1974 or so and used it for ten years until it went missing while my brother in law was visiting. As I recall, the procedure for initially pressurizing the thing required you to remove the fuel filler cap, wrap your lips around the fitting and blow vigorously into the tank. This caused an eruption of fuel that filled the little brass cup. After refitting the fuel cap, you lit the miniature gasoline lake, watched the flames reach up toward your tent top, then adjusted the burner to suit.
These stoves are still available new. I wonder what the lighting procedure is today.
The flea market find looks like a mil-spec version of a Coleman 442. I've got one of those and like it a lot.