Thanks so much, Sandra, for the dimensions!

This is a really nice set of Italian (likely Venetian) side chairs, probably late 19th century from the look of them. These are fairly popular as decorative items; here are some examples of comparable auction sales so you can get a sense of the current market:
($450) https://www.invaluable.com/auction-lot/pair-venetian-paint-decorated-side-chairs-57e4b9abb8
($400) https://www.invaluable.com/auction-lot/a-pair-giltwood-venetian-rococo-style-side-chairs-b184f049da
($937) https://www.invaluable.com/auction-lot/set-of-six-venetian-rococo-painted-side-chairs-3284cfb8e8

Based on the photographs and information provided, and subject to examination, you have:
A set of four Venetian paint decorated and parcel gilt balloon-back side chairs
Probably late 19th Century
with silk upholstery
37 inches overall height; seat height 20 inches; width 19 inches; depth 17 inches
PROVENANCE: Naples, Florida estate
$600-900 (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 for using Mearto.