Dear OF members,

I'm very fond of my Longines 8490 (my first vintage watch). It's going to get a fresh service and I'm planning to get an extract from the archives from Longines. I would also like to have an original Longines clasp for this watch to complete it. Could anyone tell me what clasp belongs to this watch?

Edit: I believe the correct term is buckle, not clasp...but not sure of this either, so correct me if I’m wrong.