HelloThank you for making your question to JustAnswer. My name is*****'m an Antiques Expert and I will try to help you with your particular inquiry. Please, don't hesitate to contact me any time or to make follow up questions if needed.
Could you provide a picture of any metal part-nail, screws..etc-of the furniture?
Also, could you inspect the furniture to try to locate the manufacturer label or mark if present?
I can appraise the furniture based in the information given, but I cannot guarantee it's a 1780 furniture. I asked for the pics in order to recheck this information. If this is ok for you, I can appraise it.
Ok, I will send yourrequest to customer service.