It's a very nice bag. I wasn't able to get any information on the possible dates for "Neiman Marcus Collection" - I only found one photo of a gold plate like yours that was dated 1980s. Can you tell me what the interior lining is - leather or fabric? Is the exterior sticky? If the exterior is not sticky, I would clean it with warm water and a soft cloth. Then apply a very thin coat of vaseline and wipe gently with a clean soft cloth. The interior looks like it has mold, at least from the photo. Can you tell me more?