Well, I didn't find anything under Costanza, and without a photo it is hard to tell if that was an owner's name or a manufacturers mark. The darkening of the wood around the nails at least tells us this is old, but how old may be difficult to tell. I've never seen one with an insert like that. Baskets were made in this style for many years and are still being produced now. My suggestion would be to post some pics on a forum for basket collecting and see if they can ID it.
