I found this interesting comment about the accuracy of watches as defined by the National Bureau of Standards. It was in an early publication on watches.
2 minutes per day was defined as accurate timepiece.
1 minute per day was defined as very good timepiece.
Less than 1 minute per day was defined as an exceptional timepiece.
This article was from the 1940's.
2 minutes per day was defined as accurate timepiece.
1 minute per day was defined as very good timepiece.
Less than 1 minute per day was defined as an exceptional timepiece.
This article was from the 1940's.
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