Date: 1923. Instrument owned by Paul Ayick.
Notice the gold plated bell and silver plated body. Also notice the fact that this instrument doesn't have a right hand pinky ring. That isn't damage: it was built that way. The "same bore as the 2B" described below is a #1 1/2 bore, 0.459". The 26B is the Low Pitch version, the 27B is the high pitch version of the instrument.
What Conn said:
The 26B trumpet possesses the same bore as the popular 2B but is built of a little heavier gauge brass for the players who like to put "steam" behind their performance. It also has the advantage of being somewhat lower in price. For symphony and concert playing, here is a beautiful instrument.
The instrument is 19 1/2" long, weighs 2 1/4 lbs and has a 4 5/8" bell. Apparently the 26B is a "Low Pitch" version, the "High Pitch" version is called the 27B