There was a brief period in Gillette's history (1947-1951) when they did not date code some of their razors, as far as I know the reason for this is not known. This razor is the notched 48-50 version, said my many to be one of the great Super speeds, and to be a tad more aggressive than its cousins in the same series.
The razor has a TTO (twist to open) function, enabled by twisting the bottom dail anti-clockwise to open the doors, and clockwise to close the doors once the blade is loaded.
The razor is in good condition with no damage apart from expected wear and tear, and one tab missing on the one side.
This razor weighs 54 grams and stands 84 mm high.