The problem with that is that is by far a much less simple explanation. For years many private companies have been contracted to make things other then their usual for militaries in time of war. A good example is the Rock-ola company. They originally made juke boxes but in WWII were commissioned to make rifles for the US military of which they were all marked Rock-ola. They were chosen because of their expertise in assembling items made of both wood and metal and also the fact their factory was easily converted for use. This ship was mostly wooden. I would not think it out of the question that this company was contracted by the Spanish to make something on this ship. With their expertise in woodworking it's not a stretch to think that this is possible. I am waiting for the Barcelona maritime museum to respond and will see.
Probably this is not an issue anymore but still... This medal is actually from a piano made by Amédée Thibout. I know a vertical piano to which the medal is attached. The piano won a silver medal in the exposition in Paris 1867 and a medal of merit in Vienna 1873. At the time, this type of pianos were usually made for yatchs because of the lack of space. Wanna see pictures of the piano?