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need some help identifying markings

TheDeadlyLlama
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does anyone know what the black markings on the inside of the back case are? it looks like i have a clean 1968 speedy with a 321 movement.

if anyone has expert information that they could provide it would be much appreciated.

thank you in advance

20250305_162725.webp 20250305_162734.webp 20250305_162806.webp
 
JimInOz
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The black markings on the caseback are a watchmakers scribble.
They are the only person on the planet that knows the meaning.
 
Canuck
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Watch repairer’s marks. Very much doubt there is a directory anywhere that would translate these scribbles.
 
Dan S
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From our favorite chat-bot:

You said:​

U6GHtqjBSOnRj7tJhLFV2DvP9LpadQGSXMcJ5Us%3D.webp

What do these markings mean?

ChatGPT said:​

The markings inside this watch case back provide important information about the watch:

1. Manufacturer & Origin​

  • Omega Watch Co. → This is an Omega watch case.
  • "FAB. SUISSE" / "SWISS MADE" → Indicates that it was manufactured in Switzerland.
  • "ACIER INOXYDABLE" → French for "stainless steel," confirming the material.

2. Reference Number​

  • The engraved numbers near the bottom (though slightly faint) likely represent the case reference number, which can help identify the specific model.

3. Watchmaker Service Marks​

  • Handwritten markings ("4/55 914")→ These were likely added by a watchmaker during a past service.
    • "4/55" → Could indicate a service performed in April 1955.
    • "914" → Possibly a watchmaker’s internal service code.

4. Manufacturer's Stamp​

  • The triangle with Omega branding was commonly used by Omega to mark its official watch cases.
If you’re trying to identify the exact model, you can cross-reference the reference number (if visible) with Omega’s archives or collector resources. Let me know if you need help with that!
 
TheDeadlyLlama
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thank you

doubt it was serviced in april of 1955 as it a 1968 watch...unless im missing something
 
Donn Chambers
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TheDeadlyLlama TheDeadlyLlama
last question. what reference number is this watch
Right there on the case back. 105.012-66. A little earlier than 1968, although it could have been sold then. What does the front look like?
 
Dan S
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TheDeadlyLlama TheDeadlyLlama
thank you

doubt it was serviced in april of 1955 as it a 1968 watch...unless im missing something
Unfortunately, you don't get any points for being smarter than a bot. If you don't crop the photos before uploading it, ChatGPT thinks it's a Rolex.

And yet, it did basically answer your question.
 
JimInOz
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To be fair to me, the OP only asked one question and I answered it without AI assistance.

TheDeadlyLlama TheDeadlyLlama
does anyone know what the black markings on the inside of the back case are?

::stirthepot::
 
Dan S
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JimInOz JimInOz
To be fair to me, the OP only asked one question and I answered it without AI assistance.



::stirthepot::
I'm just trying to figure out how to transition to the future where nobody actually knows anything, since it looks like that's the direction we're rapidly heading.
 
bsowers34
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Donn Chambers Donn Chambers
Right there on the case back. 105.012-66. A little earlier than 1968, although it could have been sold then. What does the front look like?
Yeah, we want to see the face.
 
TheDeadlyLlama
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Donn Chambers Donn Chambers
Right there on the case back. 105.012-66. A little earlier than 1968, although it could have been sold then. What does the front look like?
stratnge when i run the serial number it says 1968. ill post more pictures of the front. its one of the cleanest ive seen.
 
TheDeadlyLlama
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Donn Chambers Donn Chambers
Right there on the case back. 105.012-66. A little earlier than 1968, although it could have been sold then. What does the front look like?
if the serial number indicates its a 1968 but the reference number indicates earlier what is the right number
 
hansaboy
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Greetings, and welcome to the Forum!
I suggest that you have a look at this lovely website:
https://speedmaster101.com/

Take your time and read it a couple of times.
There´s lots of info regarding Speedmasters, and you will find your reference there also.

Enjoy!
 
Dan S
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TheDeadlyLlama TheDeadlyLlama
stratnge when i run the serial number it says 1968. ill post more pictures of the front. its one of the cleanest ive seen.
The best serial number info is at ilovemyspeedmaster.com
 
TheDeadlyLlama
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hansaboy hansaboy
Greetings, and welcome to the Forum!
I suggest that you have a look at this lovely website:
https://speedmaster101.com/

Take your time and read it a couple of times.
There´s lots of info regarding Speedmasters, and you will find your reference there also.

Enjoy!
awesome read. there were so many variations. it looks like my watch was made in the second factory which apparently a bit more rare.
 
TheDeadlyLlama
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Dan S Dan S
The best serial number info is at ilovemyspeedmaster.com
very strange. when i out my serial number in the site it comes up as it was probably made march of 1969 and it has a 145.022-68TRANSITIONAL caliber 861, but it obviously doesn't. any idea why the information is so different?
 
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