Chevy grease cap old shotgun shell old work plug and military I'd?

[Explorer.se]

Can you please tell me what I have here I found all of these items at a park over the course of 6 months. Any light to be shed on these items would be appreciated. The pro was built in 1940's but these items look older than that. Especially the shot gun shell at a park?

Thanks

 

[timwied]

The 4th picture is a temperature sender for a not too old of car. The rest is probably older, I like the shotgun shell

 

[Explorer.se]

Thank you Tim I thought it was a spark plug all this time. I appreciate it.

 

[HuntinDog]

Defiantly a electronic temp sender. don't know when they started to be used, but not to old.
The Chevy grease cap is the smaller size and would come from a car in the teens.
Your head stamp would date from 1911-1915.
Great finds
Should be some good relics there

 

[Explorer.se]

Thank you Huntin I cant wait to get back out there and keep finding some more goodies.

 

[407floyd]

1925-1928 on the Chevy grease cap

 

[Explorer.se]

Thanks 407Floyd!