Need help identifying watch model

I trying to help a friend identify this watch model from Citizen. If anyone can offer any suggestions, I would appreciate it. Thanks.

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Here’s a side view. There’s a recessed button on the top, what appears to be a faux ruby embedded in the crown, and a largish button on the bottom.

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This is the back. I’ve never seen the XC designation on a Citizen before.

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I cannot identify the exact watch in the pictures, but the xC range definitely exists. There are many videos (in Japanese) on the Citizen YouTube channel.

CITIZEN xC 2016SS Promotion Movie~美しき世界標準 クロスシー~篇 - Bing video

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pure class - love this watch