Could be a paperweight !! Back in the 40`s and 50`s they made a lot of decorative items like swans !! My grandmother had a powder box made of clear glass in a swan shape !! You can try the same way other crystal items are checked !! Just sit it on a table and use the handle of a spoon or anything similar and lightly tap below the neck of the swan,,the neck could snap off so not there,, Crystal will ring clear like a bell,,glass will be more of a dull thud !!