B767 SLIDE INADVERTENTLY DEPLOYS WHILE ATTEMPTING TO DISARM 1R DOOR AT GATE ARRIVAL.

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AT THE COMMAND OF THE PURSER'S 'FLT ATTENDANTS DISARM DOORS FOR ARR' CALL; I WENT TO DOOR 1R TO DISARM. I LIFTED THE PLASTIC COVER OF THE ARM AND DISARM LEVER AND PUSHED IN THE BUTTON; WHICH WAS WHITE BECAUSE THE COLORED PAINT HAD CHIPPED OFF. WHILE ATTEMPTING TO PULL DOWN ON THE ARM WITH MY R HAND. THE BUTTON FELT AS THOUGH IT WAS ALREADY DEPRESSED AND STUCK; AND THE DISARMING LEVER WOULD NOT COMPLETELY DISARM AS IT WAS STUCK WHILE PULLING DOWN. I APPLIED FORCE TO THE LEVER AND IT WOULD NOT GO FULLY INTO THE DISARM POS. I TURNED MY HEAD BACK TO COMMENT TO THE PURSER THAT 'THE DOOR IS STUCK' AND THEN THE LARGE HANDLE FLEW UP INTO MY L WRIST. I HEARD AND SAW THE DOOR OPEN AND STEPPED BACK TO AVOID THE DOOR HITTING ME. THE SLIDE THEN BEGAN TO DEPLOY AND I SHOUTED OUT THE DOOR; 'LOOK OUT' TO THOSE DOWN BELOW AND STOOD ASIDE. I THEN SAW SEVERAL PEOPLE BELOW AND ASKED IF EVERYONE ON THE GND WAS OK AND RECEIVED A CONFIRMING HEAD NOD. I GAVE A THUMBS UP SIGNAL AND A MAN ON THE GND GAVE THUMBS UP BACK THAT EVERYTHING WAS OK. MY L WRIST IS SORE AND THERE IS A PIECE OF MY WATCH CHIPPED OFF THAT I WORE ON MY L WRIST. I WAS ENCOURAGED TO CONTACT A SUPVR.