Inquiry on Seamaster Chronometre Cal. 352, Ref. 2577 with Rare Caseback Neptune Etching

Dear Esteemed Members,

I am reaching out to gather your insights regarding a Seamaster Chronometre, caliber 352, reference 2577. This model features an intricate etching of the Neptune logo on its case back, which I believe to be factory done, based on the design quality and striking details characteristic of Omega's craftsmanship.

To support my claim, I have included several images of the watch and Neptune case back etching below, along with an image of "Neptune's Chariot" from page 715 of A Journey Through Time (AJTT) for comparative purposes.

While this is not my watch, I am specifically interested in the case back etching as I have not encountered this specific variant before and am particularly keen to learn if any of you have come across similar case back etchings depicting King Neptune in your collections, or if you have any additional information about its rarity and/or significance.

Your collective expertise and insights would be invaluable to me as I seek to understand the rarity and significance of this watch. Thank you in advance for your contributions.

Hi Evan, yes it is the same watch with the crown replaced.

Wondering if someone had the back done by a metal smith to match the Cloisonné dial design.

As mentioned. omega may or may not be able to confirm if back is original or not