Walbeck - ESRI:37007

WKT

GEOGCS["GCS_Walbeck", 
	DATUM["D_Walbeck", 
		SPHEROID["Walbeck", 6376896.0, 302.78]], 
	PRIMEM["Greenwich", 0.0], 
	UNIT["Degree", 0.0174532925199433]]

WKT2

GEOGCRS["GCS_Walbeck", 
	DATUM["D_Walbeck", 
		ELLIPSOID["Walbeck", 6376896.0, 302.78]], 
	PRIMEM["Greenwich", 0.0], 
	CS[ellipsoidal, 2], 
	AXIS["Longitude (lon)", east, 
		ORDER[1]], 
	AXIS["Latitude (lat)", north, 
		ORDER[2]], 
	ANGLEUNIT["Degree", 0.0174532925199433], 
	ID["Esri", "37007"]]

Data from @esri/proj-codes

{
  "wkid": 37007,
  "latestWkid": 37007,
  "macro": "PE_GCS_WALBECK",
  "name": "GCS_Walbeck",
  "wkt": "GEOGCS[\"GCS_Walbeck\",DATUM[\"D_Walbeck\",SPHEROID[\"Walbeck\",6376896.0,302.78]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]]",
  "wkt2": "GEOGCRS[\"GCS_Walbeck\",DATUM[\"D_Walbeck\",ELLIPSOID[\"Walbeck\",6376896.0,302.78]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Longitude (lon)\",east,ORDER[1]],AXIS[\"Latitude (lat)\",north,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433],ID[\"Esri\",\"37007\"]]",
  "description": "Walbeck",
  "authority": "Esri",
  "version": "4.0.0",
  "deprecated": "no",
  "areaname": "World",
  "extent": {
    "slat": -90,
    "nlat": 90,
    "llon": -180,
    "rlon": 180
  }
}