What is it? Set 468
 

2720: ceramic insulator of a now-damaged sparkplug

2721: no idea

2722: an early radio (sparkgap transmitter? crystal receiver?)

2723: some kind of hole cutter; start with a pilot hole, this
scores a large-radius circle with two hardened cutterwheels

2724: there's a piston missing, I'm thinking this is a rivet
press, like for staking the rivets in Levi's jeans. Or, rhinestones,
or snaps.