I have dataframe and i would like to groupby but get the countries in one cell

Brand                   Model                    Country

IPhone                    6                            UK

IPhone                    7                            DE

IPhone                    6                            US

IPhone                    7                            FR

IPhone                    6                            IT

IPhone                    7                            NL       

I would like to have this result would this be posssible

Brand                    Model                        Country                       

IPhone                    6                             UK - US - IT

IPhone                    7                             DE - FR - NL