Hi Jesus,

Thank you for contacting Mearto with your appraisal inquiry.
Thonet (and later versions of his company) have produced approximately 50 million of this "No 14" model cafe chair and there are a LOT of them on the market; the design on the seat is a nice feature you don't always see. Regardless of that, the fair-market (auction) value for individual chairs is quite low (the value escalates rather quickly, and exponentially, the larger a set you have).
Based on the photos and information provided, and subject to examination, this is:

An antique bentwood "cafe" sidechair
Made by Michael Thonet, Vienna, 19th Century
with impressed seat in the form of a stylized shell; retains original factory label
33 1/2 inches high, 15 inches wide, 19 inches deep
CONDITION: wear commensurate to age and use
$100-150*
*represents a fair-market value for auction purposes; retail or asking price may vary.

Please let us know if you have additional items to appraise, and thank you again for using Mearto.