WWII AN 5736-1 Gyro Horizon - Sperry Ternstedt mixture

One poor 80-year-old AN 5736-1 Gyro Horizon instrument as manufactured by both Sperry Gyroscope and  General Motors - Ternstedt Divison for the war effort that has soldiered on as something of a mixture of the two makers products. We're not sure if it wants to identify as a Sperry or Ternstedt. You can decide all of that.

This early- or mid-war metal cased unit is clearly marked Sperry Gyroscope Company on the front of the instrument on the horizon bar under the glass panel. Someone also included a serial number on this unit of 85409 at some point in its civilian life, as the s/n of the instrument was NOT placed in this area by the original manufacturer. 

Turn the old girl around and stare at her backside and the case is marked with two metal data tags, one of which identifies her as made by Ternstetd Division of GM and it has a 1943 data tag assembly prefix indicating it was built for US Army Air Forces. 

What's inside? Why, quite possibly you could have the trifecta here with internals made by JAHCO (Jack & Heintz Corporation) that also made the 5736 for the war effort. But the pedigree of the internals isn't known as I haven't bothered to crack this one apart. There's an ancient sticker on the front of the glass that is brown with age and indicates "Rotor Bad" on this unit. I don't know if this was assessed by former owner or instrument shop. I do know this one rides really nicely around on the internal gyroscope and doesn't clunk or rattle or stick in place. That's usually the telltale sign when the rotor bearing assembly takes a dump on the gyro. I can manually cage this one quite nicely, too. It's a core, but it's not a lost cause. Great panel filler.  

That appears to have been the only modification of the old soldier that I can see. If you are looking for a wartime Sperry or Ternstedt to pop into a panel for display, this is a good one. 

I don't see any modifications to the case. The Caging knob and actuating rod has been removed as well but the screws are still there. I can cage the instrument with my fingers by turning the metal gear. Horizon adjust moves nicely with no binding. This one has instrument panel screw keepers (nuts) on the instrument housing.  Graphics on this instrument are mustard yellow and RADIUM CONTENT UNKNOWN. I haven't checked and never cared. Black wrinkle-finish paint is in great shape on air filter. Case paint is matte non-wrinkle and is so-so. The air filter housing is intact. 

Can't hear any clunking or rattling around on the inside of the instrument. Gyro rolls around nicely. No additional mods or drop damage to case. No evidence of water or dust or bugs or dirt behind the glass.  We'd kept this as a parts source for other 5736 units but at the end of the day we've got more than enough gyro horizon instruments and no longer need to build and mix and match. 

I can't think of a trainer, transport or bomber that didn't use the AN 5736-1 gyro during the war years through present day. 

What you see in the photo series is representative what you get.  Ships cheapest USPS Priority Mail unless you direct otherwise.  Questions? Please ask seller. And thanks for looking!