i've been on quest to complete all of the X metal frames. Technically I do not have all of the Mars frames, if you by what is said on the box, but for me this is as complete as it goes. though many will say I'm missing other lens options for the regular mars frame, I consider the serial to be the "tell" for this set. and the serials only indicate that there are three models: Mars, crater and mars leather. maybe one day i will want the rest but for now, thanks for stopping by and checking out my "complete set"