The SWL spanish callsing estructure has been  different depending of his time of use. We have the following estructurs:

1 ) EA + order (all of them before the Spanish Civil War 1936),  ie. EA-111

2) E +  order (alos used before the Spanish Civil War 1936, ie. E-111

3) E +  district number + order, ie. E-1-111

4) España + district number + order, ie. España 1-111

5) EA + district number + order+ U (optional), ie. EA1-1111-U

6) EA + district number + province code + order, ie. EA1-01-11111

Here you have a new galery with some spanish SWL qsl samples: