My take would be that this is an unsigned Flygsfors piece, unusual although that might be. I agree with you that everything about the piece says Flygsfors, except no marking on the base.
Some of the Reijmyre pieces Kedelv did were in the same spirit as Coquille, but still different. For example, this is is a piece from Reijmyre in 1958, part of the "Harlequin" line, I believe.
David