Absolutely. With only one exception to my knowledge, sail numbers 1-1000 were issued 1950-56, but I have no information on the distribution within that period.
Do check, though, that the hull number corresponds to the sail number; it is the hull number which is definitive, not the sail number, because sails can be bought and sold second-hand – and when that happens the new owners don’t always bother changing the numbers. The hull number should be engraved into the hog abaft the centreboard case; expect to have to lift a floorboard to see it.
For fuller information on the history of your boat a starting point is to ask the Association for a copy of the official records, now in digital format. Beyond that it is pure detective work …
Do have a look at the Cruising & Vintage Boats page of this website (under About in the banner menu across the top of the page). We would love to see you, with your boat, at some of our events.
Oliver