Ah, well "brilliant" is a very relative term. Next to a candle one might seem brillant, but in broad daylight...
I offer what i know...and sometimes what i only
think i know. We are all learning here and hopefully sharing what we know is what we all do, even if it is not always right.
Your wrongko is really quite nice, i think. Beautiful wood in a Sandang Walikat form. This is a form usually meant for storing, though i believe it is also acceptable in some cases for daily wear and i have seen a few more extravagant example which were no doubt meant for wearing. All my talismanic keris use this sheath form, which i suppose makes sense since they are not made to be worn like regular keris are. If i am not mistaken you will find that this sheath, though appearing simple in form, is probably carved from a single piece a wood, which is no easy feat. Thanks for showing it.