KOC Well Datum - EPSG:5789

WKT

VERTCS["KOC_Well_Datum", 
	VDATUM["KOC_Well_Datum"], 
	PARAMETER["Vertical_Shift", 0.0], 
	PARAMETER["Direction", -1.0], 
	UNIT["Meter", 1.0]]

WKT2

VERTCRS["KOC_Well_Datum", 
	VDATUM["KOC_Well_Datum"], 
	CS[vertical, 1], 
	AXIS["Gravity-related height (H)", down, 
		LENGTHUNIT["Meter", 1.0]], 
	ID["EPSG", "5789"]]

Data from @esri/proj-codes

{
  "wkid": 5789,
  "latestWkid": 5789,
  "macro": "PE_VCS_KOC_WELL_DATUM",
  "name": "KOC_Well_Datum",
  "wkt": "VERTCS[\"KOC_Well_Datum\",VDATUM[\"KOC_Well_Datum\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",-1.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "VERTCRS[\"KOC_Well_Datum\",VDATUM[\"KOC_Well_Datum\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",down,LENGTHUNIT[\"Meter\",1.0]],ID[\"EPSG\",\"5789\"]]",
  "description": "KOC Well Datum",
  "authority": "EPSG",
  "version": "6.15(9.3.0.0)",
  "deprecated": "no",
  "areaname": "Kuwait - onshore",
  "extent": {
    "slat": 28.53,
    "nlat": 30.09,
    "llon": 46.54,
    "rlon": 48.48
  }
}