Merchich - ESRI:104261

WKT

GEOGCS["GCS_Merchich", 
	DATUM["D_Merchich", 
		SPHEROID["Clarke_1880_IGN", 6378249.2, 293.4660212936265]], 
	PRIMEM["Greenwich", 0.0], 
	UNIT["Degree", 0.0174532925199433]]

WKT2

GEOGCRS["GCS_Merchich", 
	DATUM["D_Merchich", 
		ELLIPSOID["Clarke_1880_IGN", 6378249.2, 293.4660212936265]], 
	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", "4261"]]

Data from @esri/proj-codes

{
  "wkid": 104261,
  "latestWkid": 4261,
  "macro": "PE_GCS_MERCHICH",
  "name": "GCS_Merchich",
  "wkt": "GEOGCS[\"GCS_Merchich\",DATUM[\"D_Merchich\",SPHEROID[\"Clarke_1880_IGN\",6378249.2,293.4660212936265]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]]",
  "wkt2": "GEOGCRS[\"GCS_Merchich\",DATUM[\"D_Merchich\",ELLIPSOID[\"Clarke_1880_IGN\",6378249.2,293.4660212936265]],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\",\"4261\"]]",
  "description": "Merchich",
  "authority": "Esri",
  "version": "3.0.1",
  "deprecated": "codechange",
  "areaname": "Africa - Morocco and Western Sahara - onshore",
  "extent": {
    "slat": 20.71,
    "nlat": 35.97,
    "llon": -17.16,
    "rlon": -1.01
  }
}