Serial 2020TRUMP0000 Limited Edition Henry Lever Action.22 Rifle!ĮG: SDWXXX.Visually. This model was first released in 1968 under the name Sportco, but manufacturing was taken over bu Omark in the 1970's. Find SPORTCO MODEL 44 – 308 WIN in the Firearms - Rifles - Bolt Action Rifles category on. Has it got the '7.62' stamped scale plate or the unmarked 303' scale plate? The former 7.62 marked scale plate was my design in 1968 and approved by the National Rifle Association of Australia in the same year. Tell me the model number of the Central sight. The prefix was then changed to SDLxxx up to SDUxxx and designated as a 44B model. The original Omark Mod 44 started off with serial Nos at DA XXX and continued for a number of years up to DLxxx. EG: DGXXX3 letters and 3 numbers are the 44B model. 2 letters and 3 numbers are the older 44 models. Look for a 44B over the older 44.The newer model 44B had the upgraded trigger, large bolt head pin, heavier barrel, wider forestock etc.Serial numbers tell the models apart.