Not a clue

[omegared31]

I was out hunting a local school today and came across this strange item. It's 67.5mm across and non magnetic. Any ideas on this would be great Thanks in advance and HH.

 

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[Mud Hut]

The drive wheel from one of those vintage toy sparklers?

 

[oooldman]

looks like a very old thermostat from a car

 

[Chug And Red]

Top of and Old Sprinkler head Or Radiator cap HH Chug

 

[mhardy73]

Could be part of an old 8mm film reel if you found it at an old school yard. The 50ft reels were about the same size you mentioned. http://imgarcade.com/1/8mm-film-reel/

 

[kcm]

 

[Back-of-the-boat]

I think it's from an old sprinkler.

 

[DizzyDigger]

Looks to me like a very old radiator cap..?