Stern of the barge/inland tanker 'Willi S' berthed at the Rocha pier (Lisbon). This vessel entered the Lisbon harbour already cut in two (see:
http://lmcshipsandthesea.blogspot.pt/2013/10/batelao-willi-s-partido-ao-meio-entrou.html )

Moored next to Willi S is tug 'Amestista' of the APL, IMO 9080833.

Willi S - Main characteristics (whole vessel):
LOA: 99,82 m
Beam: 9,5 m
Draught: 3,3 m
GT: 844,64 t
Flag: Belize
Year of Build: 1963
Owner: Sigab Oil & Marine Services Ltd.

Ametista - Main characteristics:
MMSI: 263671860
Callsign: CSXH8
LOA: 18 m
Gross tonnage: 103 tons
Engine: 700 hp
Type: Multicat
Crane: 18 ton
Year of build: 1996
Builder: DAMEN SHIPYARD GORINCHEM - GORINCHEM, NETHERLANDS
Flag: PORTUGAL
Owner and Operator: APL (Lisbon, Portugal)