The blade on the more recent Omani is very strange. There does seem to a central rib....all be it very 'unpronounced', the blade edges are rounded

The 'wootz' pattern is very indistinct but is very fine, faked acid etched wootz is (AFAIK) much coarser and its surface 'ridged'

The blade's mat grey apearance certainly suggests its been 'etched'...perhaps too agressively with a more consentrated acid ?
If this blade is definately not wootz ....has someone deliberately or accidently create the 'look' of 'the possibility of wootz'
In general I was informed that mid to late 20th C Jambiya's had sheet metal blades ie two halves welded/braised together. Is this the case for the mass majority manufactured at that time. As this blade looks 'solid'.
Regards David