Brad, I'm going to revise and extend my remarks, the pipe could be from the 1980's, after the first sale of the company. The determinative thing is, I think the shape 15, the Rugby, and the question is when was it introduced? The "Mid 1980's" catalog at Chris Keene's pipepages shows the Rugby shape and both Two Dot and Four Dot spelled out. I'm not sure if the Made in England in a line was used in the family era, it may have been in the later years. I tend to think of the football shape Made in England for the family pipes. From what I was just reading,
"When the company was sold in 1979, one of the first things the new owners did was to eliminate the town names from the shanks. The dots were enlarged yet further, and the Sasieni name, though still done in script, was larger, as was the rest of the shank nomenclature, which in all other ways was similar to the Pre-Transition nomenclature. While these pipes are not as collectible as the family made pipes, they were made with care and are high quality.
The nomenclature changed again in 1986, with the sale of the company to the Post-Transition firm. The three line nomenclature was changed to two lines, with the first reading “Sasieni 4 Dot” and the second identifying the finish, e.g. Natural, Walnut, or Ruff Root. Note how 4 Dot is spelled, using an Arabic numeral 4, as opposed to spelling out the word “four”. This is the easiest way to spot a Post-Transition Sasieni..."
Reading this, your pipe would seem to be from the period 1979-1986.