What type of old engine is this

[nor-easter]

We visit in Wachula-Zelpho Springs Florida in March each year and they have a big gathering of single cylinder engine enthusiasts there. Fascinating to hear those make and break engines hissing and banging.
Getting back to the Three Stage Water Pump. All Babbitt Bearings with the oil resevoirs on the bearing caps. Three Stage Crank Shaft.. that unit is worth a lot to someone.