A B737-300 WAS DISPATCHED IN NON COMPLIANCE WITH THE GND CREW CALL HORN DEFERRED INOPERATIVE USING A DOMESTIC MEL. ACFT DISPATCHED OVERWATER.

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ON MAY/SAT/03; AT XA00 CST I RECEIVED A CALL FROM ZZZ2 THAT ACFT X GND CREW CALL HORN WAS INOP. AFTER REVIEWING THE MEL; I CAME ACROSS MEL 34-28-2. WHILE I REALIZED MEL 34-28 COULDN'T BE USED ON NEXT GENERATION ACFT; AND IT CLRLY MARKED IN THE ACR X MEL BOOK; UNDER MEL 34-28-2; THERE IS NO INDICATION THAT THIS IS A CLASSIC GENERATION; IE; 737-300-500; ACFT ONLY MEL. I ISSUED THE MEL AND GAVE IT NO FURTHER THOUGHT TILL THE NEXT DAY WHEN IT WAS BROUGHT TO MY ATTN THAT THIS MEL IS NOT CURRENTLY LISTED IN THE ACR Y MEL BOOKLET. AT THIS TIME I REALIZED 2 MISTAKES ON MY PART. FIRST; I INCORRECTLY DEFERRED AN ITEM USING THE ACR X MEL BOOKLET. SECOND; IT BECAME APPARENT TO ME THAT THIS MEL IS CURRENTLY NOT ALLOWED TO BE USED ON NEXT GENERATION ACFT. I WAS INFORMED THAT THE HORN HAS SINCE BEEN REPLACED AND THE MEL ITEM WAS REMOVED FROM THE ACFT LOG. AFTER REVIEWING THE NEXT GENERATION WIRING DIAGRAM AND CURRENT ACR X MEL BOOKLET; I HAVE SUBMITTED A REQUEST TO MY MGR OF GETTING A REVISION TO THE MEL TO ALLOW THE HORN DEFERRAL FOR FURTHER REF USING MEL 34-28-2. THE MEL MISTAKE IS MINE. I ISSUED THE PLACARD TO MAINT AND CTL NUMBER. IN THE FUTURE I WILL REMEMBER TO ALWAYS USE THE CORRECT GMM (GENERAL MAINT MANUAL) MEL BOOKLET AND BE MORE DILIGENT IN REVIEWING THE CORRECT MEL REF.