California SRS Epoch 2017.50 (NAD83) 3D - ESRI:104644

WKT

GEOGCS["California_SRS_Epoch_2017.50_(NAD83)_3D", 
	DATUM["California_SRS_Epoch_2017.50_(NAD83)", 
		SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
	PRIMEM["Greenwich", 0.0], 
	UNIT["Degree", 0.0174532925199433], 
	LINUNIT["Meter", 1.0]]

WKT2

GEOGCRS["California_SRS_Epoch_2017.50_(NAD83)_3D", 
	DATUM["California_SRS_Epoch_2017.50_(NAD83)", 
		ELLIPSOID["GRS_1980", 6378137.0, 298.257222101], 
		ANCHOREPOCH[2017.5]], 
	PRIMEM["Greenwich", 0.0], 
	CS[ellipsoidal, 3], 
	AXIS["Longitude (lon)", east, 
		ORDER[1], 
		ANGLEUNIT["Degree", 0.0174532925199433]], 
	AXIS["Latitude (lat)", north, 
		ORDER[2], 
		ANGLEUNIT["Degree", 0.0174532925199433]], 
	AXIS["Ellipsoidal height (h)", up, 
		ORDER[3], 
		LENGTHUNIT["Meter", 1.0]], 
	ID["Esri", "104644"]]

Data from @esri/proj-codes

{
  "wkid": 104644,
  "latestWkid": 104644,
  "macro": "PE_GCS_CSRS_EPOCH_2017_5_NAD83_3D",
  "name": "California_SRS_Epoch_2017.50_(NAD83)_3D",
  "wkt": "GEOGCS[\"California_SRS_Epoch_2017.50_(NAD83)_3D\",DATUM[\"California_SRS_Epoch_2017.50_(NAD83)\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433],LINUNIT[\"Meter\",1.0]]",
  "wkt2": "GEOGCRS[\"California_SRS_Epoch_2017.50_(NAD83)_3D\",DATUM[\"California_SRS_Epoch_2017.50_(NAD83)\",ELLIPSOID[\"GRS_1980\",6378137.0,298.257222101],ANCHOREPOCH[2017.5]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,3],AXIS[\"Longitude (lon)\",east,ORDER[1],ANGLEUNIT[\"Degree\",0.0174532925199433]],AXIS[\"Latitude (lat)\",north,ORDER[2],ANGLEUNIT[\"Degree\",0.0174532925199433]],AXIS[\"Ellipsoidal height (h)\",up,ORDER[3],LENGTHUNIT[\"Meter\",1.0]],ID[\"Esri\",\"104644\"]]",
  "description": "California SRS Epoch 2017.50 (NAD83) 3D",
  "authority": "Esri",
  "version": "12.7.0",
  "deprecated": "no",
  "areaname": "USA - California and borders of NV, AZ, OR and MX",
  "extent": {
    "slat": 32.25,
    "nlat": 42.53,
    "llon": -124.45,
    "rlon": -113.6
  }
}