ok...I give up!

[large cent hunter]

I found this in a city of 100,000 in the northeast. It is metal, not rusty, and came from the ground as you see it here. One side has lines scored in it in a fairly irregular pattern, creating sort of squares.
It does not appear to be broken or missing anything. THe backside is fairly nondescript with many irregularities in it.
I give up! What the heck is this?

 

[Patrol]

Kind of looks like the pad on the lever used to push a motorcycle centerstand down. It is cross hatched to prevent your boot slipping.

or

Could be the top of a starter button that old cars used that were located on the floor. Same thing - cross hatched to keep your foot from slipping.

Just a guess.

TE

 

[Jazdo]

doesnt look to be machine knurled. Some type of conglomerate or slag.

 

[relic lover]

every groove looks hand made maybe someones boredome project at work some guard/supervision jobs are painfully boring I have made a few such projects myself it's like hands on doodling.