Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

I would speculate the ABC Popular Science Institute tag is unrelated to anything on the board and likely placed there by the creator of that display.

There are no ABC toy steam engines although some of the uninitiated have mistakenly called Marklins with the 3 way make up water valve ABC which was on the boiler right above the valve. Each letter designated one of the 3 positions for the valve.

There was however a model steam engine called ABC and it was cast right into the base.

Below is a picture showing 2 steam engines and the drawing clearly says ABC Products Incorporated, West Los Angeles, California.
The drawing is for the engine on the left.

Gil




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