I started working on this manhole art in 2011 and am just now finishing it. After researching the names (Nicholson & Payne, Eagle Foundry) I discovered that it was manufactured in 1850 and was part of the second foundry established in what is now downtown Pittsburgh, near where the main Post Office on Grant Street stands today. So far it is the only one that I have found with longhand style lettering.
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