She looks very much like UGLEN, seen here 'at home' in Grimstad, Norway on 10/8/1981.
Owned by Ugland Construction Co A/S at that time, she was built in 1978 by A/S Nymo M/V, Grimstad, an Ugland owned yard I believe, yard number 2.
But was there a sister? Perhaps yard no. 1?
- UGLEN at Grimstad 1981