Age of a National US Radiator Boiler

[pbarbato2 (Peter Barbato, NJ Lic 24GI00158800)]

Any help will be greatly appreciated:
National US Radiator Model 5-11B. Could not find the serial number.
Thanks!

[jfudge (JR Scott Fudge, CPI)]

@pbarbato2

Any help will be greatly appreciated:
National US Radiator Model 5-11B. Could not find the serial number.
Thanks!

Would you happen to have a photo of the whole furnace?

[pbarbato2 (Peter Barbato, NJ Lic 24GI00158800)]

here are a few thanks!

[pbarbato2 (Peter Barbato, NJ Lic 24GI00158800)]

Bump

[pbarbato2 (Peter Barbato, NJ Lic 24GI00158800)]

Anyone have any input? Thanks

[spayson (Stephen Payson, CMI)]

Metal data plate = Old