primitive antique spring bolt latch for porch screen door/garden gate

Antique vintage architectural hardware... a spring bolt latch with an ornate cast iron body. It measures about 6 3/4" long overall. It is about 4" center to center on the mounting holes. The latch bolt measures about 1/2" long, 13/16" wide and 3/8" thick.

This latch moves freely, but is rusty and the surface is pitted with age.