I think that it is worth mentioning that with VERY FEW exceptions, seiko has generally always been a mass market volume manufacturer. For the most part, pieces might be hard to find in some parts of the world, but they are not necessarily rare. The fact that we can still collect so many vintage seikos going back to the 1950's, for affordable prices, and have a reasonable chance to restore them for an affordable price, should speak to the level of "rarity" of most seikos. That said, The same does not apply to specific individual parts, which at times can very easily meet Time's definition of what makes an item rare (think6138-7000 plastic pointer ring, or 5106 quickdate gear).