The Xpres on the Selfix and similar Ensign cameras was released in 1949, it's always coated.

The Ensars were made by Ross for Houghton Butcher - Ensign cameras from the early 1930's rather than in house, prior to that hey had used Aldis lenses, the top of the range models used Tessars or ocassionally Xenars. Some Ensars may have been Triplet design but not all, the name covers a family of lenses made for Ensigns.

The Ensar I've just acquired is definitely not a triplet and identical optically to the Xpres but it's clear that it'll have less contrast with no coatings, and probably be more susceptible to flare.

Ian