YES THESE WOULD SERVE AS A CLUB AND PERHAPS AS THE WOMEN WERE USUALLY THE ONES IN CHARGE OF THEM PERHAPS THEY WERE THE WOMANS WEAPON OF CHOICE. THE ROLLING PIN COMES TO MIND AS AN AMERICAN PIONEER WOMANS WEAPON ALONG WITH THE FRYING PAN.
I FOUND A SITE ( BROOKLYN MUSEUM , COLLECTIONS: ARTS OF AFRICA PESTLE.) THEY HAD QUITE A FEW LISTED BUT VERY FEW WITH PICTURES. PERHAPS YOU COULD CONTACT THEM AND SEND SOME PICTURES ALONG AND GET SOME INFORMATION. I WILL INCLUDE A FEW PICTURES. ONE IS OF A SHOP WITH MANY VARIATIONS FOR SALE. ANOTHER SHOWS 3 DIFFERENT SIZES ONE IN USE IN ETHIOPIA. TWO PICTURES OF IVORY ONES FROM CONGO ONE 16.5 IN. AND ONE 23 IN LONG. PICTURE OF A SMALL NEW ONE WITH A DIFFERENT STYLE OF HEAD. THERE ARE QUITE A FEW VARIATIONS IN HEADS AS WELL AS MORTOR CONFIGURATIONS AND SOMETIMES DIFFERENT ENDS ON THE SAME PESTLE FOR DIFFERENT USE OR DIFFERENT SHAPED MORTORS. I HAVE BEEN NOTICING MORE OBJECTS LISTED AS WAR CLUBS THAT ARE NOT ON EBAY LATELY FROM OCEANNA TO AFRICA TO THE AMERICAS.