Mystery unit insignia - WWI Croix de Lorraine and...?

I found a mystery watch fob on the FeedBag and I'm trying to figure out where I know the enameled design from. It looks like a WWI unit badge, but I"m not good enough to know whose.

 

That's the cross of St. Stephen. It is the coat of arms of Hungary.

"Hungary's coat-of-arms...tricolour red, white and green (meaning strength, fidelity and hope, respectively). The emblem includes a white double-barred cross, known as the St. Stephen's Cross and named after the first King of Hungary who later became Hungary's patron saint."

https://en.m.wikipedia.org/wiki/Coat_of_arms_of_Hungary

--- Susan

 

Aha. Thanks. It does make me wonder about the origins of that watch fob.