As far as I can tell, this is a rare one. I certainly have not come across another one.
That being said, although I appreciate vintage Eterna for their styling and their history, I certainly don't qualify as an expert and appreciate input from any experts out there who are more familiar with this reference.

Eterna Matic, automatic chronograph Reference: 684. 2169. 41
Diameter: 38 mm excluding crown
Beautiful white dial with a Day/Date calendar at 3 o'clock with quick reset, black hands, and a tachymeter scale on the bezel with blue numerals ( the blue is a nice touch on an already interesting Dial )
Automatic 17-jewel movement
Calibre Lemania 5100, Swiss made
Came on Brown Leather strap with Eterna Buckle.
I think it looks great on this stainless steel bracelet that I switched over from a vintage Tissot
Both the strap and bracelet will be included in the sale, and that's all of it. No box, no papers.
An accurate time-keeper, but I have no knowledge of service history.

Price: $1329, includes insured conus shipping. Will ship to other locations if the buyer is willing to pay the additional costs.
Omega Forums Feedback - please check, https://omegaforums.net/search/21005324/?q=pnwyankee&o=date&c[node]=10
My eBay feedback is 475 feedback ratings: 100% positive

Thanks OF for the space.

Pictures.....





The white area near the bottom of each picture is from the light source - you can see that it moves a bit from picture to picture.

Included this Black & White just because it looks so good!













The Leather Strap and Buckle it came on when I purchased it. strap has lots of life left



Here's a picture of the Dial without the weird white stripe I mentioned above