EUREF-FIN - ESRI:104129

WKT

GEOGCS["GCS_EUREF_FIN", 
	DATUM["EUREF-FIN", 
		SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
	PRIMEM["Greenwich", 0.0], 
	UNIT["Degree", 0.0174532925199433]]

WKT2

GEOGCRS["GCS_EUREF_FIN", 
	DATUM["EUREF-FIN", 
		ELLIPSOID["GRS_1980", 6378137.0, 298.257222101], 
		ANCHOREPOCH[1997.0]], 
	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", "10690"]]

Data from @esri/proj-codes

{
  "wkid": 104129,
  "latestWkid": 10690,
  "macro": "PE_GCS_EUREF_FIN",
  "name": "GCS_EUREF_FIN",
  "wkt": "GEOGCS[\"GCS_EUREF_FIN\",DATUM[\"EUREF-FIN\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]]",
  "wkt2": "GEOGCRS[\"GCS_EUREF_FIN\",DATUM[\"EUREF-FIN\",ELLIPSOID[\"GRS_1980\",6378137.0,298.257222101],ANCHOREPOCH[1997.0]],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\",\"10690\"]]",
  "description": "EUREF-FIN",
  "authority": "Esri",
  "version": "9.0.0",
  "deprecated": "codechange",
  "areaname": "Finland",
  "extent": {
    "slat": 58.84,
    "nlat": 70.09,
    "llon": 19.08,
    "rlon": 31.59
  }
}