Featured Mark on sterling multi Catholic medal necklace

The only marking on this necklace is the one in the photo of the little ring that is used to adjust the length of the necklace. Can't for the life of me understand what it says. I've tried a few possibilities and done a google image search and came up with nothing.
Everything tests sterling, but no marks. Help?!

 

I don't know the mark, but I'm pretty sure you'll go to heaven.

 

Well, this necklace may transport someone to heaven, but likely not me!

 

UNO de 50

https://www.unode50.com/us/

As far as I know (which isn't much about this brand), their silver jewelry is actually silver-plated ... but I could be wrong.


edited to add that their pieces of jewelry seem to bring pretty good (unusually high), prices when I've seen them at auction.

 

Thank you! You know I looked at it upside down, and didn't look like anything to me that way either.

 

Looks like the stuff in their current catalog is mostly "silver finished" and quite pricey for that.
I found my necklace sold in 2017 and they listed as sterling.
I will give it some more testing to be sure, but I think it is sterling.

 

<3 LOVE

 

A guaranteed entry at the pearly gates!!!

 

I found a bracelet made by them on the dance floor after a big rock concert. Tried to turn it in to lost and found but kept getting the run around. I ended up taking it home after asking a few people where I could turn it in. It sold for pretty close to $100 if I recall, maybe more.

 

That makes much more sense than "os dpona", which is what I first saw.

 

Further testing says NOT sterling.