Question about Nikon D850

No. See here;
During the promotional period from 01.11.2018 to 15.01.2019, you can benefit from up to 300.- CashBack on selected Nikon cameras and lenses.

To receive the CashBack, purchase the eligible camera during the above promotion period and register using the link below by 31.01.2019 at the latest. You can register up to three Cashback eligible lenses and up to two Cashback eligible SLR cameras or kits.

The CashBack is only valid for Nikon Switzerland products, not for imported products. The latter are marked with "Import" in the product name in our online shop. Promotional products have a red "CashBack bubble". http://www.mynikon.ch