Portimão's everlasting and ever-resting ENGENHEIRO LUÍS DA FONSECA sitting nicely off her usual berth in the fishing port during the evening offshore breeze. When they need more at Portimão during the cruise season, Svitzer send one from Sines.

Still no more details discovered:

19xx Instituto Portuário e dos Transportes Marítimos, Lisbon as ENGENHEIRO LUÍS DA FONSECA (POR flag, reg Portimão, ON PM-28-EST)
by1973 Junta Autónoma dos Portos do Barlavento do Algarve, Portimão
2014 Administração dos Portos de Sines e do Algarve SA (APS), Sines.