omega , cal 471 with, hippocamps back door. in need of info, please

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hi all. I recently obtained a omega cal=471 1955ish case ref 2790, -11sc. in working order , and very pleased with it . may question is, that the back of the watch has hippocampus , logo . has this been etched on at a later time period or is it pukka, as it should be. I have tried to google, but found no data. I hope some one can help. many thanks ....peter................ ps, photos are not so good due to lighting
 
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I think it's legit.

Found one with the same engraving.

5b17bed2-fcc3-43a9-8f1a-491e1be58323

60372e5f-7acb-439e-b64c-f44bf3965468

81ebb793-93e2-4599-a07e-7ed2b4482a5d
https://watchcharts.com/listing/687799

Had to search for 2790-11, not all Ref. 2790 have this engraving.

Learn something new everyday,
gatorcpa