This looks pretty much like the first mountain bike I had somewhen late 80s early 90s. Kettler Aluminum Rad | Vintage mountain bike, Mountain biking, Bike
Verso by Kettler 26" Vegas Cruiser 1-Speed Bicycle: Men's Bike, Blue/Black - Useful things for bikers (*Amazon Partner-Link) | Man bike, Cruiser bike, Bicycle
Kettler VERSO FALCON Bike - Blue - Boys - 16-inch: Amazon.co.uk: Sports & Outdoors
Kettler Electric Bike e-bike electrical e-blaze Cross 28 "T. 50 11-velocità 500 WH CX Black (Trekking)/e-blaze Cross 28" T. 50 11-speed 500 WH CX Black (Trekking E-bike): Amazon.co.uk: Sports & Outdoors
Bicycle For Sale And Review: Budget Kettler Grinder black/white 26 inch (2011) (Frame size: 44 cm)