Nice conjecture, some sense of Canadian manufacturers' dates are sorely needed, however it seems this is never to be. I think its safe to say there may never have been a concerted effort to itemize dates and construction details much as Old Town and others have, and we have to content ourselves with approximates and broad 'eras' based on details. Not to damn any attempts, but for what its worth none of my prefire boats have any markings, and indeed scores of boats of all eras ive both worked on and observed didnt either. Perhaps a company ledger would provide insight but it seems that whatever records were kept, they werent duplicated on individual products.