From the introduction to the 1976 Bianchi catalog:

"Bianchi celebrates 50 years of service to law enforcement and sportsmen. Since acquiring the famous old Berns-Martin Holster Company, founded in 1925 and merged with Bianchi, we have a 50 year history of producing premium quality leather products for the discriminating shooter."

Also with a tribute to the US Border Patrol on their 50th.