Jamestown 1971 height - EPSG:7888

WKT

VERTCS["Jamestown_1971_height", 
	VDATUM["Jamestown_1971"], 
	PARAMETER["Vertical_Shift", 0.0], 
	PARAMETER["Direction", 1.0], 
	UNIT["Meter", 1.0]]

WKT2

VERTCRS["Jamestown_1971_height", 
	VDATUM["Jamestown_1971"], 
	CS[vertical, 1], 
	AXIS["Gravity-related height (H)", up, 
		LENGTHUNIT["Meter", 1.0]], 
	ID["EPSG", "7888"]]

Data from @esri/proj-codes

{
  "wkid": 7888,
  "latestWkid": 7888,
  "macro": "PE_VCS_JAMESTOWN_1971_HT",
  "name": "Jamestown_1971_height",
  "wkt": "VERTCS[\"Jamestown_1971_height\",VDATUM[\"Jamestown_1971\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "VERTCRS[\"Jamestown_1971_height\",VDATUM[\"Jamestown_1971\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Meter\",1.0]],ID[\"EPSG\",\"7888\"]]",
  "description": "Jamestown 1971 height",
  "authority": "EPSG",
  "version": "9.0(10.6.0)",
  "deprecated": "no",
  "areaname": "St Helena - St Helena Island",
  "extent": {
    "slat": -16.08,
    "nlat": -15.85,
    "llon": -5.85,
    "rlon": -5.59
  }
}