I think it may be a dwarf grapefruit tree. I've linked to your album below so your pictures will be easy to view. Here is a link that might be useful: newbie76's photo album

It depends on your local market ... check Craigslist and some antique stores. Cleaning is easy: Clean it carefully ... Dust it, then use mild soap and water on a soft cloth to remove water-soluble crud. Then shift to mineral spirits and 0000 steel wool, cleaning gently to get the oil-based hand grime and such off. Stop and evaluate. Often that's all you need to do, or you find that the top needs finish removal and a new coat of something. If you have a flaky, scaly finish, that's probably old wax buildup. Remove it with a blend of lacquer thinner and denatured alcohol (I use 50/50). Apply liberally to a small area, let it soften a few moments, then gently rub off the crud with the steel wool. Repeat until clean. Do this outside, with gloves because the fumes are vile and flammable.

Your most reliable source would be the builder of that model home. Since it is new there should be no problem finding the reference number.

Pottery? Bronze? Iron? Show a picture of the whole thing... And the red chalk marks mean nothing.