When the Trojan was introduced the barrel length offerings were 28- and 30-inch in 12-gauge and only 28-inch in 16- & 20-gauge. The 1913 Flyer --
1913 Trojan Grade flyer.jpeg
Those were still the offerings in the 1916 catalog --
1916 Trojan.jpeg
By the 1923 catalog they added 26-inch barrels to all three gauges --
1923 Trojan 26-inch barrels added.jpeg
With all the errors that have been found in that serialization book I'd want a PGCA letter for peace of mind!