FRANKFURT (Reuters) - German luxury carmaker Daimler DAIGn.DE on Thursday said it plans to double sales of its Maybach-branded Mercedes-Benz vehicles, after selling 12,000 vehicles last year. Daimler unveiled its new flagship vehicle, which is based on a Mercedes-Benz S-Class limousine, and which retails starting at $173,000 but can quickly add up to more than $250,000 once options like $3,200 silver champagne flutes are added. Daimler plans to make a range of Maybach models, including fully electric variants, Chief Executive Ola Kaellenius said during a virtual presentation of the car.