Hi Jim,
I believe the hilt/forte section of the sword is West African, I too have seen the cross symbol before....and like you and Tim cannot 'place' it. The 'guard' looks like some of the Akan goldweight designs ....and I wouldn't be surprised if the 'cross' symbol is Akan (or neighbouring regions). Although not in this 'sample' of symbols, here are a few which are quite stylised ...and some similar....
http://www.adinkra.org/htmls/adinkra_index.htm
Its the main section of the blade that seems to be the
.....yes perfect for the symbolism of the snake....but seems unlikely to be locally made. Could such blades been supplied as imported 'trade blades' ? ....I think unlikely. Perhaps the blade was traded with the East Coast (via India, trade between India and the West coast has been well established for hundreds of years)... and carried overland to the West via the numerous trade routes.
I also agree with you and Tim, a status sword makes sense, if the hilt is solid iron/steel the weight could improve the balance, if carried, ceremonially 'upright'.
I wonder whether a fellow formite bought this, and if they did, I hope they post it.
Regards David