CH1903+ - ESRI:115875

WKT

VERTCS["CH1903+", 
	DATUM["D_CH1903+", 
		SPHEROID["Bessel_1841", 6377397.155, 299.1528128]], 
	PARAMETER["Vertical_Shift", 0.0], 
	PARAMETER["Direction", 1.0], 
	UNIT["Meter", 1.0]]

WKT2

VERTCRS["CH1903+", 
	DATUM["D_CH1903+", 
		ELLIPSOID["Bessel_1841", 6377397.155, 299.1528128]], 
	CS[vertical, 1], 
	AXIS["Ellipsoidal height (h)", up, 
		LENGTHUNIT["Meter", 1.0]], 
	ID["Esri", "115875"]]

Data from @esri/proj-codes

{
  "wkid": 115875,
  "latestWkid": 115875,
  "macro": "PE_VCS_CH1903_PLUS",
  "name": "CH1903+",
  "wkt": "VERTCS[\"CH1903+\",DATUM[\"D_CH1903+\",SPHEROID[\"Bessel_1841\",6377397.155,299.1528128]],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "VERTCRS[\"CH1903+\",DATUM[\"D_CH1903+\",ELLIPSOID[\"Bessel_1841\",6377397.155,299.1528128]],CS[vertical,1],AXIS[\"Ellipsoidal height (h)\",up,LENGTHUNIT[\"Meter\",1.0]],ID[\"Esri\",\"115875\"]]",
  "description": "CH1903+",
  "authority": "Esri",
  "version": "13.0.0",
  "deprecated": "no",
  "areaname": "Europe - Liechtenstein and Switzerland",
  "extent": {
    "slat": 45.81,
    "nlat": 47.81,
    "llon": 5.95,
    "rlon": 10.5
  }
}