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That appears to be the same colour as the Nasco replacement block I had years ago ( which I stupidly gave away ) so I'd guess that engine would either be a replacement block or ex industrial motor that GMH made for various industrial applications.
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Unless its been restamped as there appers to be a "step" in the machined face of the number pad..... or it is just the photo that makes it appear so??

It does look that way, must check when I get back home.

Cheers

Peter

And here is another one for you, the grey block I have has a number 204355 and that is it. WHY

AAARRRHHHH Tim you are a font of knowlage...

Tim, the NOS Nasco block I had was over 25 years ago now ( when no one wanted them ) and I still remember it had that waxy type protective coating you often see on NOS metal parts and the green was a sort of lightish industrial looking colour ( how do you describe a colour in words ).I guess it could be possible that it may have been unpainted originally and some previous owner had painted it the green colour that I found it in ...... dunno ??.

It was sitting in the rear of an FB wagon that was given to me at the time alomg with some other parts.

From memory it was unstamped and I spent a long time at the local GMH parts counter trying to find out details of it.Eventually the old shop foreman walked in ( he was an apprentice in 1948 when the FX's hit the showroom floor ) and he said it was a 138 replacement block.When measured,it had a standard bore and had definately had no use as indicated by the bores condition.

Dickhead me gave it away eventually

dave68 wrote:AAARRRHHHH Tim you are a font of knowlage...

Tim might be a lot of things but a font is a bit harsh

Sorry I spelled it wrong; fount: a source or origin....
Thus ends or english class for today.