I'm not an expert, but I believe that the following is accurate with respect to Kaywoodie pipes, and if also applicable to this Templar pipe, suggests a date range of 1924 - 1936:
1. Starting in 1924 the ampersand was dropped from the KBB initials in the clover stamp.
2. Starting in 1936 the Imported Briar stamp was used in place of prior stampings such as Algerian Bruyere, Aged Bruyere, Grecian Briar, etc.
There is what I consider to be a very good article on Kaywoodie pipes by Dennis Moore in the Summer 1999 - Winter 2000 Pipe Smoker's Ephemeris. He notes that the first Kaywoodies (1919 - 1924) were stamped with a four-digit shape number. In 1924 Kaywoodie introduced the Drinkless pipe (push tenon with stinger) which were stamped with a two-digit shape number. In 1929 Kaywoodie introduced the Synchro-stem pipe (metal screw tenon with stinger), at which time it returned to stamping pipes with a four-digit shape number. If the foregoing is also applicable to the Templar pipe, then it suggests to me that the date range could be narrowed to 1924 - 1929. If that is in fact a good date range, the lack of a stinger in the Templar pipe wouldn't surprise me as the stinger was the selling point for the Drinkless pipe.