JACOBSEN 2 CYCLE ENGINE VINTAGE ENGINE BLOCK,  I'm not familar with the Jacobsen but I was told this is probably a 521 engine used on Turf King and Lawn King in the early 50's.   Casting numbers are  2078 and 2580 

The cylinder bore has some scoring - not real deep but it will need to be cleaned up.  It's working days are probably over but would make a good show runner.

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