Hi Colin,
I'd attribute both to North Nigeria or Cameroon. The ones I have are similar to the second one you show and the butt cap also reminds me strongly of brass work from that region. Adamawa etc.
See
http://www.vikingsword.com/vb/showthread.php?t=15391 which includes a scan from waffen aus zentral-afrika.
Both you show are very nice examples! I am quite jealous.