What is on my property???

[diggergirl]

Hi everyone,
We’ve been cleaning up the yard and digging around a bit. I found these stamped markers. They don’t line up and there are at least two or three separate ones (hard to dig with a toddler). Some were in a fire pit. Then I realized we have an old pole (tree?) with a pulley (not a clothesline) and nails going up it. My home was built in 1940, but in a historic 18th 19th century mill area. (Bristol ct). Any clue what this is? Thank you so much!

 

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[Tdog]

I think I see the word SERVICE on one piece--pic 8/8 on post #1.

 

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[DigToChina]

I think I see the word SERVICE on one piece--pic 8/8 on post #1.

Agreed. I was about to post the same. Also notice the repeating of the “ONT/STE” on 3/8. I’m thinking it’s more like a manufacturing stamp on bricks than keystone/gravestone as suggested above.