Accutron Question Page.||||| Frequently Asked Questions Also see 01. Why is my 214? The electronic circuit in your 214 (commonly referred to as the coil) was designed to run on 1.35 volt mercury batteries which are no longer sold in the USA. Currently available batteries produce 1.55 volts. Perfect adjustment of the index mechanism was not as critical with the lower voltage of mercury batteries as it is with silver oxide batteries. The higher voltage (+0.2V) can cause some movements to run too fast.
If this happens to your 214 it is usually because the adjustment of your Accutron was borderline in the first instance and you will have to have the movement professionally adjusted. COIL MODIFICATION: Is your Accutron running way too fast? Bulova Date Codes. Prior to 1926, the use of case serial numbers was inconsistent. Dating a Bulova Bulova Date Codes. How to Use our Vintage Watch Serial. The individual serial numbers of EVERY watch. Back off the watch case to see the movement serial number which may. Vintage Bulova Watch Search. Search the vintage Bulova watch database by movement. Ladies Bulova Watch Serial NumbersA readily available 1.55V silver oxide battery usually works well and most 214's can be adjusted to run properly without any difficulty but there are some movements which can only be described as over-active. The adjustment of an over-active movement with a 1.5V battery is so tenuous that any external force will cause the movement to speed up. This explains why some watches run great on the dresser but too fast when worn while others will run well for a while until a hard bump causes them to slip out of adjustment. The bottom of each 214 tuning fork tine was notched at the factory to set the frequency (click photo). A relative few have tuning forks that were cut to the thinner end of their tolerances. Bulova Watch Case Serial Number LookupThis was OK when the magnets were energized by 1.3 volts but at 1.5 volts these forks are over-active. This causes them to index two teeth instead of one either periodically or with every stroke. Previously the only way to correct the problem was to replace the tuning fork with one that has thicker tines but that is not a reliable solution to the problem. Experience has shown that quite often, the watch will run well for months after the fork is swapped, but the movement is still susceptible to speeding up after suffering a severe shock. Fortunately there is a way to permanently solve the problem. A diode which lowers battery voltage in the circuit by 0.2 volts can be installed in the coil. This is really the best possible solution to the problem. Watch Case Serial Number LookupThe watch will perform as it did when new, battery issues will be resolved, and the life of the coil will be extended. Whether actually needed or not, this inexpensive modification is highly recommended. It is not noticeable and it is reversible. The micro-thin coil wire used in your 214 is already working against the ravages of age. Running an over-voltage of.2V through the delicate wire can't possibly be a good idea. The other delicate components in the circuit will not benefit either.
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