Mine has the model number just under the Stoeger logo
You can maybe try to get more info here. Air Arms, Air Rifles manufacturers | Stoeger Airguns
The stippling on the stock does look the same as the X20.
I am quite happy with it. I have taken off the open sights and fitted a Nikko Stirling 4.5-14x50 Panamax to it and up to 30 meters it is fairly accurate.
It is a little bit hold sensitive and does not do well with heavier pellets. It does like the 8.02 gr BSA Red Star and Blue Star pellets. Jsb 8.44 also group nicely below 30 m but I am not that good of a shot beyond this range.