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Welcome to the forum. Yes, the proper battery replacement for the 214 is the 387s. However, watchmakers do install different batteries, as long as they fit, when they don't have the proper battery in stock. Most all of these batteries today are 1.55 volts so it really does not matter if the size is slightly different. The original mercury (Hg) batteries were 1.35 volts and were outlawed here many years ago. There is some debate over whether it is bad to install a 1.55v battery in our Accutrons. Purists tend to recommend the Accucell-1 because it has a diode in it to reduce voltage from 1.55 to 1.35. MANY folks have used the modern silver oxide batteries in their Accutrons for years without any problems. In some cases, the movement may have to be regulated (timed) for the new, higher voltage but that's all. If you do buy the expensive Accucell-1, know that it won't last as long as the 387s because there is a smaller battery in the module - maybe 9 months instead of a year. I believe you could leave the Seiko battery in your watch, keeping the new 387s until next year.Hope this helps.

BTW, we require pictures!! Just kidding about the "requirement" but we do like to see other folks Accutrons.
 
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