This thing weighs around 250 pounds

[ohnojoey]

I don't know anything about furniture but this is closer to the turn of the century as per who it came from.

It's 6 feet long and 3 feet high.
The only mark is a number, but no other indication who made it;
I suppose it would difficult to know this? 

[sonomabarn67]

Looks like an American factory made sideboard about 1920 in the Spanish/ Mediterranian style. If it is really that heavy it might be solid walnut.

[ohnojoey]

Thank you! I appreciate the information.