The First Series Digital World Time from SEIKO
Model No. M158-5000 and M158-5009
There are essentially 3 models in the M158 series, two intended for the North American markets (the M158-5009) and one intended for all other markets. The following information will help you determine if a specific example is authentic and original.
The North American Versions
Model No. M158-5009
Under the 5009 sub-model number two watches were produced, one with a stainless steel finish, the other gold plated.
Both watches share the same bracelet style and code. The only difference between them is the finish of the case and bracelet, either stainless steel or gold plated.
The bracelet code can be found on the underside of the end links - engraved on the tube that holds the spring bars. It should read Z-129 for all M158-5009's. The style and spacing of the bracelet style designation is different between the stainless steel and gold-plated versions.
The Dial Frames
The Stainless steel dial frame is finished in a black, while the gold-tone version is finished in a gilt/yellow color. Both display the cities as 3-letter abbreviations around the dial.
Both versions share the same dial code: M158-5029T.
The International Version
Model No. M158-5000
The international version of the M158 was only produced in stainless steel, included a different bracelet and different dial frame when compared with the North American versions. It was produced under sub-model number 5000.
Like most SEIKO watches of the day, the bracelet style code is found on the underside of the end links, on the tube that holds the spring bars. For this version the correct bracelet code is XAS020.
The Dial Frame
The international version of the M158 has a different dial frame when compared with the North American version. Instead of displaying an inner track of time zone offset hours and abbreviated city names, this version omits the offset hour markers and opts for full cities names - presumably for ease of use in non-English speaking markets.
Additionally the QUARTZ LC designation at the bottom left of the dial frame is simplified to read QUARTZ.
The correct dial frame code is: M158-5000T.
These watches are fairly robust and many good, working examples can be found today. When considering the purchase of a vintage M158, there are a few additional things you should check if possible:
- Does the light work? The bottom button on the right side of the case will activate the corner light - which is on the left-side of the dial.
- Does the watch work? Be wary of any items sold as is without a battery - often these are bad modules, as a proven good module will command a much higher price, and replacement batteries are easy to find and swap out.
- Are there any dead or dim segments in the LCD? This can be checked by pressing the top and the bottom buttons on the right-hand side of the display simultaneously. This will illuminate all segments on the display. Check against the pattern below.
Counterfeits and Copies of The Seiko M158 PAN AM
As the saying goes, imitation is the highest form of flattery. And the SEIKO M158 had quite a few admirers.
The Seiko World Time M158-500X - PAN AM
All about the 1st series of digital LCD world time watch from SEIKO, produced in 1977
Old Ad Scans: Seiko World Time M158-500X
A small collection of ad and catalog scans of the SEIKO World Time M158-500X
Counterfeits and Copies of The Seiko A239
As the saying goes, imitation is the highest form of flattery. And the SEIKO A239 had quite a few admirers.
The Seiko World Time A239-50XX - The WOPR
All about the 3rd series of digital LCD world time watch from SEIKO, produced in 1979
Old Ad Scans: Seiko World Time A239-50XX
A small collection of ad and catalog scans of the SEIKO World Time A239-50XX
The Seiko World Time A358-500X - The Alarm
All about the 2nd series of digital LCD world time watch from SEIKO, produced in 1979
The Seiko World Time A708-5000 - The TWA
All about the 4th series of digital LCD world time watch from SEIKO, produced from 1984 through 1988
The Seiko World Time A718-5010 - The Frankenstein
All about the A718-5010 digital LCD world time watch from SEIKO, produced in 1984
The Seiko World Time A718-5030 - The John Cleese
All about the A718-5030 digital LCD world time watch from SEIKO, produced in 1984
Authenticating The Seiko World Time 6117-640X
Tips on confirming the originality of your Seiko World Time 6117-640X
Authenticating The Seiko World Time 6217-7000
Tips on confirming the originality of your Seiko World Time 6217-7000
Reference Cities - Changes over the Years
A history of changes to the Cities Dial Frames on SEIKO World Time digital watches from 1977 through 1988