ETRF90 - ESRI:104179

WKT

GEOGCS["ETRF90", 
	DATUM["European_Terrestrial_Reference_Frame_1990", 
		SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
	PRIMEM["Greenwich", 0.0], 
	UNIT["Degree", 0.0174532925199433]]

WKT2

GEOGCRS["ETRF90", 
	DYNAMIC[
		FRAMEEPOCH[1989.0], 
		MODEL["AM0-2"]], 
	DATUM["European_Terrestrial_Reference_Frame_1990", 
		ELLIPSOID["GRS_1980", 6378137.0, 298.257222101]], 
	PRIMEM["Greenwich", 0.0], 
	CS[ellipsoidal, 2], 
	AXIS["Latitude (lat)", north, 
		ORDER[1]], 
	AXIS["Longitude (lon)", east, 
		ORDER[2]], 
	ANGLEUNIT["Degree", 0.0174532925199433], 
	ID["Esri", "9060"]]

Data from @esri/proj-codes

{
  "wkid": 104179,
  "latestWkid": 9060,
  "macro": "PE_GCS_ETRF_1990",
  "name": "ETRF90",
  "wkt": "GEOGCS[\"ETRF90\",DATUM[\"European_Terrestrial_Reference_Frame_1990\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]]",
  "wkt2": "GEOGCRS[\"ETRF90\",DYNAMIC[FRAMEEPOCH[1989.0],MODEL[\"AM0-2\"]],DATUM[\"European_Terrestrial_Reference_Frame_1990\",ELLIPSOID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Latitude (lat)\",north,ORDER[1]],AXIS[\"Longitude (lon)\",east,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433],ID[\"Esri\",\"9060\"]]",
  "description": "ETRF90",
  "authority": "Esri",
  "version": "10.6.0",
  "deprecated": "codechange",
  "areaname": "Europe - ETRF",
  "extent": {
    "slat": 33.26,
    "nlat": 84.73,
    "llon": -16.1,
    "rlon": 38.01
  },
  "frameEpoch": 1989,
  "deformationModel": "AM0-2"
}