Big coin? ?

[jimzz977]

I went today to a new location where the old court house use to be and was demolished in the 1930s and School was built just recently a addition is being added the ground is dug up and in found this I thought is was a coin , the edge looks like coin but no marking that I can see its big as a dollar coin , it came as 78 / 80 on my T2

 

[pepperj]

Rosette

 

[Jason in Enid]

Id lean more towards it being a watch case back.

 

[jewelerguy]

reeded edge, but no details on either side. looks to have one spot that might have had something soldered to it at one time. makes me think it's a pendulum weight for a clock

 

[Loco-Digger]

I believe Jason got it. Looks like it goes to a pocket watch

 

[williedigit]

Nice