Waukesha MagnaPlus Synchronous AC Generator. Info taken from the tag image in the pic set:

• Model: 431PSL6202 
• Serial: MX200951 (11/13) 
• Part No: 431PSL6262
• Adaption: 1-14
• Frame: 431
• Enclosure: Open
• PF: 0.8
• RPM 1800
• HZ: 60
• Phase:3
• AMB: 40
• Field AMPS: 2.2
• Field Volts: 55
• Continuous Duty
  • KW: 150
  • KVA: 188
  • Volts: 240
  • AMPS: 451

Waukesha - Scania Diesel engine. Serial No. 67793 Size: 127 x 145MM

Waukesha Engomatic Control: Model 2000 Serial No. RU17005. Amps: AC 225, Volts: AC-480Y//277 & DC - 24.