Steam Boiler Age

Looking for the age of a Fuel Chief oil-fired, steam boiler.

Data tag indicates it was manufactured by the Paragon Oil Company. I know from my notes that Paragon was a division of Texaco since the late 50’s. I have seen other Fuel Chief equipment built by Dunkirk, but I don’t think that is the case here.

Model # FCS4 - 315

Serial # 8004 - 906

Beckett burner (and pump) date to 1996 as does the Watts PRV.

Boiler appears to be late '50’s/early '60’s equipment.

Thank you in advance for any help