As for E-vin 1783 to be the first to have finned oil filter is not to say it was the last non finned!
Steve Swan of US forum claims his from new CB750 E-vin46XX had a no finned filter.
Last sunday of August '69 I saw in Sweden 2 CB750 both with finned filter. E-vin about 23XX.
Ordered one next day from Honda dealer in town for my E-vin1638.
As for knowing this exact E-vin somebody once cited a service bulletin here or in the US forum.
Erling.