Ignition Distributor [distributor assembly]
*Aluminum housing/base with a 3-bolt mounting flange
*Vacuum advance canister on the side
*Multi-pin electrical connectors and wiring
*Internal rotor and electronic components visible when cap is removed
*marking 4190728on black plastic section, not sure what it means
This is a complete electronic distributor unit [not the older points-style]. Common in many 1980s-1990s 4-cylinder [and some other] engines from Toyota, Honda, Nissan, Mazda, Mitsubishi and others before vehicles switched fully to coil-on-plug systems.