Seamaster Backs on Speedmasters...
"Put-Togethers" or Factory protocol?
Originally written by Chuck Maddox
on 5 September 2000,
Last updated on 2 February 2006 20:25 GMT

From time to time in the TimeZone Omega Forum we get queries about Speedmasters that sport a caseback with Seamaster on the back. Here is the schtick...

In the course of writting my article on the Speedmaster 125, I sent the following question to John Deithelm of Omega Vintage Information (email vintage information on Omega's site if you wish to ask questions btw)...

Index:
Mark Series
Day-Date Automatic c.1045
Speedmaster 125
German Market (Teutonics)
Flightmaster
Speedsonic

Also, a non-Speedmaster 125 question that I am asked from time to time...

What is the background on the use of "Seamaster" cases on certain Speedmasters (most commonly Mark series, and c.1045 Speedmasters)? I assume it is because Omega considered these watches to be in water-resistant cases, but are these watches also considered part of the Seamaster line as well as the Speedmaster line?

Mr. Deithelm's reply:

* the case back of such watches are all showing the " seahorse " emblem, since all these watches were originally in the* SEAMASTER * line, although the official name of the Jubilee version is:

SEAMASTER - Speedmaster Professional 125 - chronograph

* it is only much later, when the " chronograph " vogue became so voluminous that we had to separate the sporty SEAMASTER watches from the " chronographs " and give them a separate line !

Hence, because the Speedmaster was considered part of the Seamaster line, they often sported Seamaster backs.

The 1970's were an interesting time in Bienne and the swiss watch industry. Omega had a lot of things going on: Olympic and other sporting event timing, development and production of LCD, LED, Quartz, Tuning Fork, as well as a large varieties of mechanical movements, and the production of a huge number of very different watches. The current product line is a pale shade of what the product line was in the 1970's. As a result you see a lot of really weird Omega's (and Heuer's, Seiko's, etc...). Thus you see a lot of things that look like pieces of the puzzle that don't really fit like one would think they should...

In other words, there is little or no rhyme or reason to which Speedmasters sport Speedmaster Backs and which sport Seamaster Backs... Here is a short list:

 

 Omega Speedmaster Mark Series

Case Reference:
Year:
Calibre:
Description:
Case Back:

Notes:

145.014
1970
c.861

Mark II Professional

Large Speedmaster Stamp

Large Hippocampus & Speedmaster stamped into case back

176.002
1971
c.1040

Mark III(a) Automatic/Pro

Large Seamaster Stamp

176.009
1974
c.1040

Mark IV Professional

Speedmaster Medalion

376.0806
1984
c.1045

Mark V

Seamaster Medalion

   

Omega Speedmaster Day-Date Automatic c.1045

Ref.#:
Year:
Calibre:
Description:
Case Back:

Notes:

176.0012
1974
c.1045

Mark IV case

Seamaster Medalion

176.0014
1974
c.1045

TV Dial/Link Bracelet

Seamaster Medalion

176.0015
1974
c.1045

Tonneau /Bar Bracelet

Seamaster Medalion

176.0016
1974
c.1045

Tonneau/Link Bracelet

Seamaster Medalion

176.0017
1974
c.1045

TV Dial/Bar Bracelet

Seamaster Medalion

376.0806
1984
c.1045

Mark V

Seamaster Medalion

376.0822
1987
c.1045

Moonwatch Case

Speedmaster Medalion

   

 Omega Speedmaster 125

Ref.#:
Year:
Calibre:
Description:
Case Back:

Notes:

378.0801
1973
c.1041

Speedmaster 125

Speedmaster Medalion

   

 Omega Speedmaster German Market (Teutonics)

Ref.#:
Year:
Calibre:
Description:
Case Back:

Notes:

376.0803
1983
c.861

Manual Wind

Seamaster Medalion

376.0806
1984
c.1045

Mark V

Seamaster Medalion

 

 Omega Flightmaster

Ref.#:
Year:
Calibre:
Description:
Case Back:

Notes:

145.013
1969
c.910

Flightmaster c.910

flightmaster with plane

Capitalization on caseback is lowercase...

145.036
1975
c.911

Flightmaster c.911

flightmaster with plane

Capitalization on caseback is lowercase...

 

 Omega Speedsonic

Ref.#:
Year:
Calibre:
Description:
Case Back:

Notes:

188.0001
1975
c.1255

Speedsonic Lobstertail

Seamaster Medalion

188.0002
1975
c.1255

Speedsonic Blue Dial

Seamaster Medalion

 
This list is compiled via direct observation from examples in my collection and what I've seen with other collector's examples.
 
I hope this is useful/helpful information...

-- Chuck