To my knowledge, Glock never manufactured any subcompacts in RTF2. The only slide difference with the RTF2 guns, was the rear cocking serrations which were curved and are commonly referred to as "fish gill" slide serrations; other than that, the finish, etc. on the slides were exactly the same. I can almost promise you that it is not an RTF2, though I would be curious to see pictures of it if you are able.
Welcome to the Forum too, by the way.