• Bendix P/N MN-97B OMNI-MAG, S/N 464-1M
• The gauge has 3.12 in.diameter face OD, with 2.5 in. panel hole spacing.
•  Visually this gauge face and glass is in very nice condition.The gauge is in exceptionally good condition-no damage or dents, electrical connectors intact and not bent, tests functional with continuity. 
•  Unit still has all its original factory stamps and functional test stamps on it.  
•  Manufactured in Baltimore, MD.
  
•  Wt. 3lb. 3 3/4oz.
•  It comes "as is", absent logs or airworthiness tags.
•  Non-smoker home

I know some of the gauge history, for I purchased from an antique aircraft parts house, here on eBay, in 2006.  This gauge has been in my protected collection since that time, under the anticipation that it would become a component within a home aircraft simulator.   Well, that's now out, your in,............ it can now be yours. 

Buyer responsible for airworthiness inspection, it is just possible that this could be made restoration flightworthy and be put on your Lockheed Constellation, P2-V, Boeing B-29.