There are 2 versions of the chair in the archive: standard, as well as the version with armrests. Five color variations. More colors on the manufacturer's website.

Dimensions:
a) 46 x 50 x 79 cm.
b) 56 x 50 x79 cm.

Link to the manufacturer's website:
https://www.archiproducts.com/ru/%D0%BF%D1%80%D0%BE%D0%B4%D1%83%D0%BA%D1%82%D1%8B/colli-casa/%  D1%81%D1%82%D1%83%D0%BB-lerici-%D1%81%D1%82%D1%83%D0%BB_142060
http://www.collicasa.it/Sito/it_IT/11504/lerici-sedia-metallo-rivestimento-cuoio.html 

The number of polygons is indicated for two chairs
Polys: 30144
Verts: 30208

Please note that there are seams in the model. You can lighten the scene by simply removing the seam geometry.