I think the HN is also used in the RR approved with dual time zones....yes/no?Nice scope! I remember you mentioning it. Well, I can answer part of your question. The "H" means it was equipped with a hack spring. Sometimes we do see double date stamps because the mvt. was produced one year but not cased until the other year. Kind of an unusual gap for the time frame. I have read about the "N" part but will have to look it up again.
Edit: Skypilot got it! IIRC, there is a 214H just for the addition of a hack spring, with the 214HN being in the Astronaut only with it's GMT hand.
Surely one of the regulars has a dual time zone RR approved and could answer that???? I'm sure one or more of you has outbid me on on more than one in the past :001_rolleyes::biggrin:I wonder if it still has the Astronaut pinion and hour wheel still? Wouldn't that be cool... I'm not sure what I'm looking for though