The jambiya is the traditional knife of Yemeni males and is an important cultural facet.
This one is of the thouma variety and might date back to the 1800s, judging by the wear. The wooden grip has been decorated with nails, copper and brass with a tin sheet backing.
The handle is broken beneath the brass wrap and it shows movement—this is something that could be remedied with glue but whether to undertake this repair would be a decision for the next owner. The blade is good and probably made from a pattern-welded steel. The sheath is leather and iron over a wooden core.
The most incredible piece to me is the astounding pierced openwork showing what an incredible piece this must have been when first made. This piece can be yours for £315 or best offer.