Juan Melcher was probably of German origin as were a number of other organ makers who came to settle in Spain because of wars in their home country. It would appear that he set up with Aquilino Amezua and later on his own. He then became associated with the organ maker, Ramón Mar, which is why, for a number of years the company was known as such.

This instrument cost 35,000 pesetas and operates with a mechanical transmission system using piston stops.