Lao 1997 - ESRI:115743

WKT

VERTCS["Lao_1997", 
	DATUM["D_Lao_National_Datum_1997", 
		SPHEROID["Krasovsky_1940", 6378245.0, 298.3]], 
	PARAMETER["Vertical_Shift", 0.0], 
	PARAMETER["Direction", 1.0], 
	UNIT["Meter", 1.0]]

WKT2

VERTCRS["Lao_1997", 
	DATUM["D_Lao_National_Datum_1997", 
		ELLIPSOID["Krasovsky_1940", 6378245.0, 298.3]], 
	CS[vertical, 1], 
	AXIS["Ellipsoidal height (h)", up, 
		LENGTHUNIT["Meter", 1.0]], 
	ID["Esri", "115743"]]

Data from @esri/proj-codes

{
  "wkid": 115743,
  "latestWkid": 115743,
  "macro": "PE_VCS_LAO_1997",
  "name": "Lao_1997",
  "wkt": "VERTCS[\"Lao_1997\",DATUM[\"D_Lao_National_Datum_1997\",SPHEROID[\"Krasovsky_1940\",6378245.0,298.3]],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "VERTCRS[\"Lao_1997\",DATUM[\"D_Lao_National_Datum_1997\",ELLIPSOID[\"Krasovsky_1940\",6378245.0,298.3]],CS[vertical,1],AXIS[\"Ellipsoidal height (h)\",up,LENGTHUNIT[\"Meter\",1.0]],ID[\"Esri\",\"115743\"]]",
  "description": "Lao 1997",
  "authority": "Esri",
  "version": "10.4.0",
  "deprecated": "no",
  "areaname": "Laos",
  "extent": {
    "slat": 13.92,
    "nlat": 22.5,
    "llon": 100.09,
    "rlon": 107.64
  }
}