I found 1680 for arborwear https://www.amazon.com/Arborwear-Mens-RAC-Chainsaw-Chaps/dp/B00ZG3VPIM and https://www.forestry-suppliers.com/product_pages/products.php?mi=89171&itemnum=23808
Stihl lists 400 https://www.stihlusa.com/products/protective-and-work-wear/chain-saw-protective-apparel/wdcttrchaps/