Sorry if this is the wrong place to post this. recently purchased a home built in the 1920's the heating is working fine but I was curious at how old the boiler was. There are index cards with service dates on them that go back to 1979 but I suspect it's even older. I googled for at least an hour and could not find it. The info I know:
Built by US Radiator Corp in Detroit michigan
Series no. 6-11
seems to labeled capitol? Maybe that's the model?
basically whats on this label I took a screen shot of. Here it is:
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