Radiator identification

From the photo, shape and markings look correct.
With an open radiator, its not unusual to dump a little coolant out the overflow. Especially after getting stuck in traffic on hot day and then shutting down.
When it cools down and you look in the top tank, the coolant will be at least an inch down from the top. Normal, as long as its above the top of the fins.

PS. With an open system and a soldered copper radiator and heater core, its best to use 'conventional' green coolant, even though it needs to be replaced every few years. Even though this may mean buying store brand rather than big name, the corrossion inhibitors with conventional are a better match than the organic acid technology (OAT and HOAT) in the 'universal' green coolant.