I felt my professional [sic] reputation was somewhat at risk if I left that rifle grenade go unidentified. With regular access to the internet, I've checked it now, and am 99.9% certain it was a Yugoslav M60P1 30mm rifle grenade.
So, not very interesting, and could have come from almost anywhere. Still, it does underline the fact that Kenyan forces actually use a fair bit of Eastern European-spec weaponry, at least in terms of their SALW - in contrast to the assertions of a number of 'arms experts', who told the media around the time of the MV Faina "arms to Kenya/Sudan" episode that Kenyan forces didn't use any former Soviet bloc weaponry (and thus that the T-72 tanks, AKM rifles and multiple rocket launchers on the MV Faina were unlikely to be for Kenya). So much for that. Yugoslavia/Serbia's arms industry is, admittedly, something of a bridgehead between NATO-standard and former-Soviet specs and calibres. But I've also seen lots of Kenyan police with AK-47s and AKMs, including both former Soviet types and Type 56-2s.
I really need to get a new job.