WestWall 1939-40, Ring Stone from Siegfried Line fortifications Info. Please

[littleneckhalfshell]

Found this in a box of rocks I got from the daughter of a deceased Rock Collector, he also did some lapidary work as a hobby.

I know it relates to the West Wall Fortifications we usually refer to the Siegfried Line of the Germans on the French Border. A search online shows many rings with WestWall and 1939-40 cast in metal on the ring. Also a bunch of Rings with a cut stone mounted on a ring with the aforementioned information.
The cut stone rings I have seen are red or blue stones, but mine is Black. Another difference is that there are many variations of the theme, mine has an artillery piece, others seem to show bunkers.

Is there any particular importance to it being a black stone, or are the variations just individual soldiers and construction people have rings made to their specifications to commemorate their involvement with the creation of Germany's bastion?

 

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[NOLA_Ken]

These are all souvenir rings, and there are a lot of variations to be found. The color doesn't have any special meaning, and is likely just whatever the jeweler had on hand. It's a real shame the rest of the ring is missing, this one would be really nice, but the stone wil still interest collectors... I'm interested, and I know others would be. Value I really can't say...

Genuine westwall ring?