Unidentified 5.75 Velo-Dog cartridge

Can anyone id this headstamp?


UEE, Unión Española de Explosivos

Thank you.

Just for the fun, It must be noted that UEE worked in close connection with the French SFM, at the beginning of XXth century, mostly with French assets, and very often, they loaded and headstamped locally brass imported from France.
The same goes for cardboard boxes, with the only difference being in the label.