I was going to say it looked like a replacement top on the treadle but after a closer look I'm not too certain. It's a pretty machine and certainly an old one but unless it's really a rare machine it isn't worth that in my opinion. I would want something a bit more ornate and complete for the money. A replacement drawer can be built but it wouldn't be an exact match without finding one to copy.
My 2 cents,
Rodney