Bulova's "Accutron" watches, first sold in October 1960, use a 360 hertz tuning fork instead of a balance wheel as the timekeeping element. The inventor, Max Hetzel, was born in Basel, Switzerland, and joined the Bulova Watch Company of Bienne, Switzerland, in 1948. The tuning fork was powered by a one-transistor electronic oscillator circuit, so the Accutron qualifies as the first "electronic watch". Instead of the ticking sound made by mechanical watches, the Accutron had a faint, high pitch hum which came from the vibrating tuning fork. A forerunner of modern quartz watches which also keep time with a vibrating resonator, the Accutron was guaranteed to be accurate to a minute per month, or 2 seconds per day, considerably better than mechanical watches of the time.
The tuning fork movement was a horological revolution. Previously, electronically regulated timepieces were limited to some scientific instruments, being too large for a personal watch. The Accutron was also the first wristwatch precise enough to qualify for U.S. railroad certification. A wristwatch regularly moves in all possible directions, as opposed to a pocket watch which spends the vast majority of its life either mostly vertical or mostly horizontal. Prior to the Accutron, that movement affected the precision of all wristwatches to a degree which precluded railroad certification, even for the best made and most expensive chronometer certified wristwatches. The ability to legitimately claim the Accutron as the most precise wristwatch in existence was a tremendous boon for the company.CONTENTS
SERIES 214
39 pages
- Special tools and Equipment
- Diagnosis
- Special Points
- Procedures for Testing
- Procedures for Disassembly
- Cleaning
- Oiling
- Procedures for Reassembly
- Regulation Following Repair
- Information and Hints for the ACCUTRON Repairman
- Parts List
CONTENTS
SERIES 218
52 pages
- SERVICING PROCEDURES
- REPAIR OF THE BASIC MOVEMENT
- REPAIR OF DATE MECHANISM IN 218D
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| Feedback | From Buyer | Date/time |
| Very nice, and quick shipping! A ++ Thanks! | p**********2 ( 1043 | 2020-04-02 02:53:26 | |
| good deal, as advertised | b*****5 ( 1044 | 2020-03-06 18:14:41 | |
| I got my order. I recommend this seller. Thank you. | s*******9 ( 1399 | 2019-12-14 00:37:13 | |
| Good | i*************2 ( 24 | 2019-10-23 19:13:13 | |
| Item received as described. Thank you! | m********a ( 627 | 2019-10-03 13:53:33 |