This is an antique treadle sewing machine with hide-away stand in oak and cast iron by the Singer Sewing Machine Company. The machine has serial numbers AC360494 on it which indicates it was one of 35,000 alotted on October 11, 1928 in Class Model 66. The Singer 66 uses Class 66 bobbins, 15x1 needles, has an oscillating hook and low shank. Yours does not have the extra decorative decal on it. The estimate is based on actual recent past recorded auction sales of comparables. Retail 'asking prices' can be higher and vary.