This lovely large clasp is solid 925 Sterling Silver, made in the UK
and designed for 4 strand chains / necklaces.
Size is 20mm x 4mm maximum thickness.
Weight is 3.1 grams
Each chain end attaches to one wing end (top)
Note that due to the way the locking mechanism is constructed
the butterfly is not one rigid piece, but will move slightly down
it’s central axis.