crossrhodes

Does anyone know anything about antique furniture? My mom gave me this sideboard/buffet server, which was given to her 10 yrs ago by an elderly couple from church. We don’t know its history but, after some research online, I found similar pieces selling anywhere between $1,500 to $24,000. (Mom, are you reading this???) I almost sold it for $50 at our yard sale today just to get rid of it.

This is what I know of it so far:

1. The middle drawers are dovetailed and velvet-lined.
2. It has either a serpentine or bow front. Or part bow, part serpentine?
3. I believe the drawer beneath the middle drawer is called a “tambour”. Is that correct?
4. The style is Sheraton or Hepplewhite. The George III Hepplewhites from England (circa 1790-1800) are the ones selling for $24,000. There are less expensive Hepplewhites from the US (circa 1800-1950). How can I determine the style and country of origin?
5. The wood is either Mahogany or Walnut. Can anyone tell me which one?
6. The hardware looks original. The drop ring-style handles are definitely of the period.

It definitely needs refinishing. I’m afraid to take it to an antique dealer until I know for sure what I have. Can anyone help me?