In case it helps, I found skeleton references to two current vessels:

Norwegian yacht STOREGUTT, c/s LJ2427, MMSI 257501870
owner Mats Bryne, Sandnes

Danish sailing yacht STOREGUT, c/s XPC4513
owner Bo Sørensen

Looking at the name pennant the name STOREGUT might be a likely guess. But I do not know this one. (Storegut is a mountain in the area, it is also the name of a man known to Norwegians through the work of 19th cent. writer A O Vinje.)
Uwe