How old is my Richardson?

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I bought a house that has a Richardson coal furnace converted to oil with diverta-tee hot water. Hard to read the plate on the boiler but I think it reads A71(7?). I'd like to know more about this unit.

Thanks,
Dave

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  • Cutler
    Cutler Posts: 2
    Found a serice tag

    from 1987!
    States burner is a Crown Deluxe App No 1452d
    Nozzle size 1.00
    Angle 80
    Spray H
    Efficiency 75%

    How does one measure the efficiency of an old boiler?
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