I'm calling this a 1928 Trojan though the movement is obviously 1927. Fifteen jewel, 10AN movement is consistent with the other, earlier models in the database.
The watch is 27.6mm (width excluding crown) X 28.7mm (length excluding lugs. The band is 14mm and, though its obviously old, I very much doubt its original as the buckle is gold.
Can't tell if the dial or cathedral hands are radium. If they are, they don't glow in the dark anymore.