Yes, it is possible to engrave or personalize the back of a meteorite watch. However, it is important to consider the composition and structure of each meteorite. Different types of meteorites have varying levels of hardness and can be more challenging to engrave compared to traditional metals. It is advisable to consult with a professional jeweler or watchmaker who specializes in working with meteorite materials to ensure proper engraving techniques are used to maintain the integrity of the watch.