Advice needed for Omega Cosmic Triple Date Cal.381 / 27DL or 380 / 27D

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Hi all,
I really need your help, as I cant progress any further in this case:
Since two years, I am searching for an Omega from around 1950 and my interest fell on the triple date models, caliber 381. Recently, I stumbled upon a model without moonphase, which I like a lot - but I am not sure about the authenticity. The seller is a businessman, which bought the watch as it is 15 years ago from a german watchmaker. When I saw the watch, I was hoping it would reveal a Caliber 380 on the inside, which it did not, unfortunately.
I saw a lot of Triple dates with caliber 381 or former 27DL PC AM in the web, and the remark that the caliber was produced by lemania. According to Omegas Caliber list, there was an Omega caliber 380 which was "non commercialisé", and had the title 27D PC AM without the L for Lunar.
As the watch is definitely a matter that is near my heart, I would ask you for your opinion on following points:

- How can i find out if this is the caliber 27D PC AM and not a "simple" 27DL PC AM without the moonphase complication (as it maybe broke and someone just removed it completely and used a new dial or the moonphase complication is still there and they just used another dial as they did not like the moon).
- What could be the reason that the number of the caliber is not indicated (381 or 380)?

Any other comment is welcome, too! I am looking forward to your support!
Best,

Leo

Here you can see some Pics:

Comparable Lemania 27D sharing the movement and similar dial:



Regular Omega Triple Date Moonphase 381 / 27DL:


Maybe Omega Triple Date Cal 380 - 27 D


Inside of maybe Omega Triple Date Cal 380 - 27 D (with blurred 8-digit serial Nr.)
 
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I can't tell in your photo, but the early caliber numbers are sometimes under the balance.
 
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Hi Dan,
I assume those could have be seen without disassembling?!? Here is a close-up of the moment, when the balance is not moving, but I cant see anything like a serial Nr.
Never seen a "27DL..:" written under the balance - but I saw some triple date moonphase calibers without the 381 written, online.

 
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From the front it looks like an Omega ref 2471, do you have a picture of the inside case back?

Also how many adjuster buttons are in the case? That might give you the easy answer to your question, a TDMP case will have three, one for the date, one for the month and one for the moonphase. The day is set by manually cycling through the hours.
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