There has been quite a bit of discussion regarding tube replacement, tube life, whether it's possible to request customized tube colors, etc. But I don't recall whether anyone has pondered a possible future issue. It seems that all current models use strictly green and yellow tubes. Far as I can tell, blue or red tubes are no longer being used. (If I'm wrong about this, feel free to correct me). But what about the folks who currently own a watch that is equipped with blue tubes, such as the Fireman 40mm or the original Night Train? What happens when the tubes have reached their usable life and need to be replaced? Will the tubes be replaced on a like-for-like basis, or will the blue tubes be replaced with green or yellow? My three Balls are all fitted with green and yellow tubes, so at this point it's a non-issue with me. But if I owned one of the older blue-tubed models, it would be a shame to lose the unique color combination.
Anyone have any knowledge?