I would appreciate any information you may be able to provide regarding the pen in the attached photos. It has the Winged Dupont stamp, so I'm assuming it's sterling silver. The clip is encrusted with diamonds. I don't see a serial number. I've done hours of research, but to no avail. I'm looking for the model name, collection, vintage, original retail, and anything else at all that you're willing to pass along. Thanks so much, in advance.