The Leupold Alaskan was manufactured from 1990-1991 and marketed from '90-'92 in 2.5x, 4x and 6x according to the internet...
I have a similar butt plate in my "junque", but I believe that it is a stamping.http://www2.leupold.com/resources/My...ndanswers.aspx
The Leupold Answer Guide
Alaskan Scopes
Leupold introduced the Alaskan scopes in 1990. All three waterproof scope models feature a Duplex reticle and a 7/8" steel maintube. Alaskan 2.5X Alaskan 4X Alaskan 6X The Alaskan scopes were discontinued in 1991.
Alaskan Scope Repair Policy
The Alaskan scope is warranted for five years from the date of purchase to be free of defects in material and/or workmanship. We stand behind every scope we make, and traditionally have made every effort to be fair to scope owners.
Alaskan Rings
Introduced in 1990. Precision-machined from solid steel, designed to complement the Alaskan scope's traditional blued steel finish. The 7/8"inch Alaskan rings fit any Leupold STD mount base. #44281 - Super Low #44276 - Low #44456 - Medium The Leupold Alaskan 7/8" rings were discontinued in 1992.