O-Scale - Brass - 0-6-2 Heavy Engine and Tender - #77. No Box - No Foam. Interesting Heavy cast Bronze/Brass engine and tender. Looks like an early model.
Maybe All-Nation, Lobaugh or Central Locomotive works? Looks like the collector removed the front truck - do not have it. Screw needed to firmly attach boiler to chassis.
Also looks like a new can motor was installed - not tested.