Hmmm, If I was selling Shell Cordovan id definitely say where it came from.
There are only 5 tanneries in the world that I know of that make Shell Cordovan: Horween, USA, Joseph Clayton and sons,England. Shinki-Hikaku Co. Japan. Conceria Cloe and Rocado SRL from Italy.

Just going by price id have to guess that it wasnt shell. Buying, making and at a profit for 55 euros? Seems doubtful...

https://www.quercur.com/en/asentador...n-espanol.html