Ford script cast in block just above water intake?

[Brad in Germany]

I was recently sent a photo of a Model A engine with a Ford script cast into the block just above the water intake (below the engine number block). Under the Ford script are the letters "GS". The engine is supposedly from late 1931. Here's the photo:


Is this really a Model A engine block?

Was that Ford script associated with a certain year?

Could this be a foreign cast engine block?

What do the letters "GS" stand for??

Does the engine number block look like it has been ground off and re-stamped?

Please share any insight that you might have,
Brad in Maryland