We use to call the 1902 version of the model 1878 double-action: "The Colt Alaskan".
('Blarney' explanation was that the big trigger-guard was for 'gloved' hands).

I didn't realize a heavier mainspring was added to the Colt model 1878 in 1902, so the revolver could reliably ignite U.S. military primers. A longer trigger was needed to give more leverage. A bigger guard was required to clear the longer trigger.

Over 4,000 of these went to the Philippines, mainly to arm the Constabulary.