"The Keris Sulok or Sundang" by E. Banks has been discussed in the past. While he doubts the keris was made by Bornean Malays he states the Sulok/Sundang "certainly" was made in Brunei for a time. There you go back to the common sense problem of explaining how smiths that never made the keris come up with Cato's "18thC" kris, a sword with remarkable workmanship. Although I haven't see any accurate discription of the swords, early western explorers were impressed with arms of early Brunei.
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