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Moly/Iron frequently appears on blocks of Hercules industrial engines.
Hercules Industrial Engines of Canton, Ohio (not to be confused with the Hercules hit-and-miss singles) were found in every imaginable type of industrial machinery, many heavy and commercial trucks as well as agricultural and marine applications. When built, they're given an ID plate riveted to the block just left of center of the right side (if it were in a truck, with flywheel facing rear), behind where an updraft carbeurator would be. Of course, they came with updraft, downdraft, and sidedraft carbeurators, gaseous mixers, and (with an appropriate cylinder head) injection pump and injectors for compression-ignition applications...
From the 30s through the 60's, They used a 'modular' design, meaning that the large and small engines were similar, just scaled appropriate for the displacement and quantity of cylinders needed... Fours and sixes being most common... they ranged from the little ZXA (around 60ci) through the IXA, IXKs in CLETRACs, up to the QXD and QXLDs in many harvesters and irrigation pumps, up up to the JXD (320, and the JXLD (long stroke - 338ci) LDT (478ci), RXC (529ci) HXC/HXD (855ci) and DFXE (895ci).... and many, many, many others. The first two letters gets you in a general ballpark size, and after that, the presence of an L identifies long stroke... after that, a -3 means three timing gears, while a -5 signifies a 5-gear timing (and concordant auxiliary PTO point). Eventually Hercules was absorbed by White, which as a holding company, amalgated Oliver, Minneapolis-Moline, and many others... so you'll see Hercules-made engines in many of those companys' products.
It may even have been re-designated with another company's name. D&&r& used a Hercules-made twin cylinder for the first half-or-so of their "L-series' tractors, Hercules identified it as the NXB... basically half of a ZXB engine... arranged in 'odd fire' orientation, so that it had the 'Two Cylinder' sound of their larger engines.
It could be a Continental, or a Waukesha...possibly a Dodge industrial (similar to that in the Power Wagon trucks of the late 40's.
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