B-00286-1, PAC-550390, Lamar Piper Aircraft Voltage Regulator

Lamar Voltage Regulator. Model B-00286-1 or PAC-550390 or PAC550390. 28V.
It fits twin Piper models:

• Piper Apache PA-23-235
• Piper Aztec PA-23-250
• Piper Navajo PA-31
• Piper Navajo PA-31-300
• Piper Navajo PA-31-325
• Piper Navajo PA-31-350
• Piper Navajo PA-31P
• Piper Seneca PA-34-220T
• Piper Aerostar PA-60 
• Piper Aerostar PA-60-601
• Piper Aerostar PA-60-601P
• Piper Aerostar PA-60-602P
• Piper Aerostar PA-60-700P

Also fits any 28V Twin Engine Beech or Cessna.
Lists for over $300!!  It was removed from a salvage aircraft.