Electrical connector having seamless shielding shell and single row of contacts

An electrical connector assembly comprising:

• a plug connector and a receptacle connector configured to be adapted for mating with each other,
• said plug connector including:
• an insulative plug housing enclosed in a metallic plug shielding shell and including a horizontal base with a vertical mating tongue surrounded by a vertical peripheral wall with a vertical annular groove therebetween, said peripheral wall being fully circumferentially enclosed by the plug shielding shell;
• one row of plug contacts secured to the plug housing along a longitudinal direction, each of said plug contacts including a contacting portion positioned upon the mating tongue, a soldering portion exposed under the base, and a securing portion located between the contacting portion and the soldering portion and retained to the housing;
• said receptacle connector including:
• an insulative receptacle housing enclosed in a metallic receptacle shielding shell and including a horizontal base with a vertical lip having a groove therein;
• one row of receptacle contacts secured to the receptacle housing along the longitudinal direction, each of said receptacle contacts including a contacting section disposed in the groove, a soldering section located under the base, and a securing section located between the contacting section and the soldering section and retained to the housing;
• wherein
• said plug contacts are arranged with opposite orientations alternately and said receptacle contacts are arranged with opposite orientations alternately;
• wherein
• in each coupled/paired plug contact and receptacle contact, the soldering portion of the plug contact and the soldering section of the receptacle contact are located by opposite sides of the mating tongue, viewed along said longitudinal direction.