How old is this gun Winchester model 250 serial number 339956?

I would like to start with,Winchester never kept production records of the 200 series by year in relation to there serial numbers.With that said the 200 series(models 250,270,290,255,and 275)Where introduced between the years 1963-1965.The winchester model 250 was discontinued in the year 1974.There were a total of 1,600,000 made of all the models listed.I would say that your model 250 with the serial number that you provided,was probably made in between 1966-1968.