Thanks, Bob. I would be surprised if it is the boiler number: even the late production ones only reach 4 digits like '2600' - at least the ones I have seen and the records I have. Boilers have lots of dates and digits on them, as they were stamped each time they were tested. The longer in service, the more numbers. That number just seems too large for the boiler production number. Can you send the image to my email address, perhaps?
Regards
Mike C
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