NAD 1983 (MA11) - ESRI:115759

WKT

VERTCS["NAD_1983_MA11", 
	DATUM["D_NAD_1983_MA11", 
		SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
	PARAMETER["Vertical_Shift", 0.0], 
	PARAMETER["Direction", 1.0], 
	UNIT["Meter", 1.0]]

WKT2

VERTCRS["NAD_1983_MA11", 
	DYNAMIC[
		FRAMEEPOCH[2012.4467], 
		MODEL["HTDP"]], 
	DATUM["D_NAD_1983_MA11", 
		ELLIPSOID["GRS_1980", 6378137.0, 298.257222101]], 
	CS[vertical, 1], 
	AXIS["Ellipsoidal height (h)", up, 
		LENGTHUNIT["Meter", 1.0]], 
	ID["Esri", "115759"]]

Data from @esri/proj-codes

{
  "wkid": 115759,
  "latestWkid": 115759,
  "macro": "PE_VCS_NAD_1983_MA11",
  "name": "NAD_1983_MA11",
  "wkt": "VERTCS[\"NAD_1983_MA11\",DATUM[\"D_NAD_1983_MA11\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "VERTCRS[\"NAD_1983_MA11\",DYNAMIC[FRAMEEPOCH[2012.4467],MODEL[\"HTDP\"]],DATUM[\"D_NAD_1983_MA11\",ELLIPSOID[\"GRS_1980\",6378137.0,298.257222101]],CS[vertical,1],AXIS[\"Ellipsoidal height (h)\",up,LENGTHUNIT[\"Meter\",1.0]],ID[\"Esri\",\"115759\"]]",
  "description": "NAD 1983 (MA11)",
  "authority": "Esri",
  "version": "10.4.0",
  "deprecated": "no",
  "areaname": "Pacific - US interests Mariana plate",
  "extent": {
    "slat": 1.64,
    "nlat": 23.9,
    "llon": 129.48,
    "rlon": 149.55
  }
}