MAGNA-SIRGAS CMT12 - ESRI:103599

WKT

PROJCS["MAGNA-SIRGAS_CMT12", 
	GEOGCS["GCS_MAGNA", 
		DATUM["D_MAGNA", 
			SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	PROJECTION["Transverse_Mercator"], 
	PARAMETER["False_Easting", 5000000.0], 
	PARAMETER["False_Northing", 2000000.0], 
	PARAMETER["Central_Meridian", -73.0], 
	PARAMETER["Scale_Factor", 0.9992], 
	PARAMETER["Latitude_Of_Origin", 4.0], 
	UNIT["Meter", 1.0]]

WKT2

PROJCRS["MAGNA-SIRGAS_CMT12", 
	BASEGEOGCRS["GCS_MAGNA", 
		DATUM["D_MAGNA", 
			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]], 
	CONVERSION["Transverse_Mercator", 
		METHOD["Transverse_Mercator"], 
		PARAMETER["False_Easting", 5000000.0], 
		PARAMETER["False_Northing", 2000000.0], 
		PARAMETER["Central_Meridian", -73.0], 
		PARAMETER["Scale_Factor", 0.9992], 
		PARAMETER["Latitude_Of_Origin", 4.0]], 
	CS[Cartesian, 2], 
	AXIS["Easting (X)", east, 
		ORDER[1]], 
	AXIS["Northing (Y)", north, 
		ORDER[2]], 
	LENGTHUNIT["Meter", 1.0], 
	ID["Esri", "103599"]]

Data from @esri/proj-codes

{
  "wkid": 103599,
  "latestWkid": 103599,
  "gcsWkid": 4686,
  "macro": "PE_PCS_MAGNA_SIRGAS_CMT12",
  "name": "MAGNA-SIRGAS_CMT12",
  "wkt": "PROJCS[\"MAGNA-SIRGAS_CMT12\",GEOGCS[\"GCS_MAGNA\",DATUM[\"D_MAGNA\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",5000000.0],PARAMETER[\"False_Northing\",2000000.0],PARAMETER[\"Central_Meridian\",-73.0],PARAMETER[\"Scale_Factor\",0.9992],PARAMETER[\"Latitude_Of_Origin\",4.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "PROJCRS[\"MAGNA-SIRGAS_CMT12\",BASEGEOGCRS[\"GCS_MAGNA\",DATUM[\"D_MAGNA\",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]],CONVERSION[\"Transverse_Mercator\",METHOD[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",5000000.0],PARAMETER[\"False_Northing\",2000000.0],PARAMETER[\"Central_Meridian\",-73.0],PARAMETER[\"Scale_Factor\",0.9992],PARAMETER[\"Latitude_Of_Origin\",4.0]],CS[Cartesian,2],AXIS[\"Easting (X)\",east,ORDER[1]],AXIS[\"Northing (Y)\",north,ORDER[2]],LENGTHUNIT[\"Meter\",1.0],ID[\"Esri\",\"103599\"]]",
  "description": "MAGNA-SIRGAS CMT12",
  "authority": "Esri",
  "version": "12.7.0",
  "deprecated": "no",
  "areaname": "Colombia",
  "extent": {
    "slat": -4.23,
    "nlat": 15.51,
    "llon": -84.77,
    "rlon": -66.87
  }
}