General Construction Notes for Westco Products Ltd:
Often the model number will be stamped into the metalwork in the back, in front of the serial number - ie: if you find 126 3454 then its probably a model 126. This is not always the case, but its pretty common. Often a different number stamp will be used as well, so the model code and the serial number will be in different 'fonts'. Here are a couple of examples:
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