A good guess for the year of production would be either 1970 or 1978. It’s not so much that the stamping is worn down but rather that it was pretty muddy to begin with. The nomenclature is worn down a bit, but every letter is clearly legible. It was all probably lightly stamped to begin with. It is a Grp. 5, shape # 51011 and the bowl condition is very good. There are tooth indents on both sides of the stem. Not deep, but certainly visible. The draw is open and let me confess that on the dry puffing to determine the draw, I liked very much the taste of the latakia blend that was used in bringing this pipe to the life it was born for. It was clean tasting, too. Go for it.
5.55” long, bowl 1.8” tall. Weight: 1 7/8 oz., 53 grams.