Lead Seal? To what?

[Dug]

Dug this quarter sized item at an early house site. At first I thought it was a large pewter flat button until I cleaned it off.

Assume it is a lead seal but to what? On the backside I can see three letters. The first letter is hard to read with the flap covering it but I believe it to be an S but it could be a B. When I started to try to gently bend it back it started to crack so I stopped. It appears to read SUI/BUI. The front side is a No.8

Anyone familiar with this type of seal and know what it was used for?

 

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[Tony in SC]

Looks like the lead markers that were nailed on power poles or cross ties?

 

[Dug]

Looks like the lead markers that were nailed on power poles or cross ties?

Don't know, but the odd thing is that the closest powerline is at least a half mile away as this house site dates from the early 1800s to 1870s and is tucked away in the woods. It was about 8 inches down and found near an old flat button.