Guam 1963 - ESRI:37220

WKT

GEOGCS["GCS_Guam_1963", 
	DATUM["D_Guam_1963", 
		SPHEROID["Clarke_1866", 6378206.4, 294.9786982]], 
	PRIMEM["Greenwich", 0.0], 
	UNIT["Degree", 0.0174532925199433]]

WKT2

GEOGCRS["GCS_Guam_1963", 
	DATUM["D_Guam_1963", 
		ELLIPSOID["Clarke_1866", 6378206.4, 294.9786982]], 
	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", "4675"]]

Data from @esri/proj-codes

{
  "wkid": 37220,
  "latestWkid": 4675,
  "macro": "PE_GCS_GUAM_1963",
  "name": "GCS_Guam_1963",
  "wkt": "GEOGCS[\"GCS_Guam_1963\",DATUM[\"D_Guam_1963\",SPHEROID[\"Clarke_1866\",6378206.4,294.9786982]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]]",
  "wkt2": "GEOGCRS[\"GCS_Guam_1963\",DATUM[\"D_Guam_1963\",ELLIPSOID[\"Clarke_1866\",6378206.4,294.9786982]],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\",\"4675\"]]",
  "description": "Guam 1963",
  "authority": "Esri",
  "version": "4.0.0",
  "deprecated": "codechange",
  "areaname": "Pacific - US interests Mariana plate",
  "extent": {
    "slat": 1.64,
    "nlat": 23.9,
    "llon": 129.48,
    "rlon": 149.55
  }
}