Singer Treadle Sewing Machine

How to determine the age of an old Singer treadle sewing machine.?

Where do I find the serial number, model number, or anything that would help determine the age of an old Singer treadle machine.

http://www.singerco.com/support/model_number.html
http://www.singerco.com/support/serial_numbers.html

Singer Treadle Sewing Machine $650.00

Vintage SINGER Treadle Sewing Machine Base-100% Comp!! $33.01

Vintage SINGER Treadle SEWING MACHINE Trade Card Italy $9.99

Front Drawer from Singer Treadle Sewing Machine $9.95

SINGER TREADLE SEWING MACHINE TOP BRASS HINGES HINGE $0.99

SINGER TREADLE SEWING MACHINE PUZZLE BOX W/ ACCESSORIES $19.99

1946 Singer Sewing Machine Model 66 Treadle With Extras $44.00

1923 Singer Sewing Machine Model 101 Treadle Vintage! $19.00

1913 Singer Treadle Red Eye Model 66 Sewing Machine $600.00

SINGER TREADLE SEWING MACHINE BASE CENTERING BOLTS $12.95

SINGER TREADLE SEWING MACHINE PITMAN ARM CONECTING ROD $22.95

SINGER TREADLE SEWING MACHINE PARTS BASE BOLTS SET OF 2 $8.95

SINGER TREADLE SEWING MACHINE FLYWHEEL SET SCREW PARTS $6.95

Singer Sewing Machine Adv.Wood Thermometer Girl Treadle $10.00

Treadle Sewing Machine Belt Plier Tool Vintage Singer $49.99

Singer Sewing Machine "Treadle" Hand Crank $7.88

Antique Singer Treadle Sewing Machine $74.99

ANTIQUE SINGER TREADLE SEWING MACHINE CABINET W/DRAWERS $199.00

Antique Singer Treadle Sewing Machine Cabinet Key $13.09

ANTIQUE 1899 SINGER TREADLE SEWING MACHINE PUZZLE BOX $9.99

Instructions for Using Singer Sewing Machine No. 66 with Attachments No. 35920, Lock Stitch, for Family Use (Form 8232, May, 1916) Instructions for Using Singer Sewing Machine No. 66 with Attachments No. 35920, Lock Stitch, for Family Use (Form 8232, May, 1916). Small paperback booklet, illustrated with black-and-white photographs. 36 pages. Stapled binding....