We also have the instruction manuals for the various variations which likely provides a better starting date than the roll mark drawing date if you have the earliest instruction sheet for the model and variation. It is not safe to assume that the different variations were produced consecutively when it is know that some later models were produced concurrently. But we don't know the end date of production of a given model. WE also have the date of the roll mark drawing which could have been a month or ten months before the gun was actually introduced. Note the catalogs were sometimes late in changing the descriptions. The data we have to go on is matching the features listed in the catalog against the gun's features.
It is even usually tough to impossible to determine the year. For the early models before the assembly date code,it is impossible to determine the month and year of assembly.
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