Hi Kuk,
Yes, there are agricultural barungs in the Central Visayas, but I believe that came about through cultural exchange between the Bangsamoro tribes and the Bisaya/Cebuano. BTW, I also picked up an agricultural barung crafted by the same Zamboanga smiths, and a karit (sickle) I saw used for slicing through banana stems.
It would definitely allay all doubt if someone had an antique version of an agricultural barung/pira, but I guess farm tools wouldn't be cared for and passed down in the same manner.
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