The Seiko Monster is no doubt a signature design by Seiko. It started off as a 200m rated diver released in the early 2000s. Due to its popularity, several limited edition as well as JDM models were introduced. In recent years, they are powered by the 4R movement. Besides the 200m diver, Seiko also make several Seiko 5 models that have the monster look. Two nice models that they released recently are the fieldmonster (SRP441) and the mini monster (SRP481K) shown above.