This is a bronze hydraulic motor that was originally used to drive a bilge pump in an amphibious vehicle.  This would make a great super high quality weather resistant hydaulic motor for various projects.  

Manufacturer: Pesco Products Div of Borg-Warner Corp.

• Mfr. No.: 062547-010-01
• Alternate p/n: V11-001-107
• NSN: 2090-653-4389
• Type: Hydraulic gear motor
• Rating: 3 hp at 1800 rpm
• Operating pressure: 550 psi max
• Shaft rotation (from drive end): CW
• Shaft:
• 11 spline
• 3/4" long X 1/2" diameter
• ports: 1/2" NPT
• Housing most likely bronze
• unused condition
• Used in the LARC-LX amphibious vehicle