Kertau Singapore Grid - EPSG:24500

WKT

PROJCS["Kertau_Singapore_Grid", 
	GEOGCS["GCS_Kertau", 
		DATUM["D_Kertau", 
			SPHEROID["Everest_1830_Modified", 6377304.063, 300.8017]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	PROJECTION["Cassini"], 
	PARAMETER["False_Easting", 30000.0], 
	PARAMETER["False_Northing", 30000.0], 
	PARAMETER["Central_Meridian", 103.8530022222222], 
	PARAMETER["Scale_Factor", 1.0], 
	PARAMETER["Latitude_Of_Origin", 1.287646666666667], 
	UNIT["Meter", 1.0]]

WKT2

PROJCRS["Kertau_Singapore_Grid", 
	BASEGEOGCRS["GCS_Kertau", 
		DATUM["D_Kertau", 
			ELLIPSOID["Everest_1830_Modified", 6377304.063, 300.8017]], 
		PRIMEM["Greenwich", 0.0], 
		CS[ellipsoidal, 2], 
		AXIS["Latitude (lat)", north, 
			ORDER[1]], 
		AXIS["Longitude (lon)", east, 
			ORDER[2]], 
		ANGLEUNIT["Degree", 0.0174532925199433]], 
	CONVERSION["Cassini", 
		METHOD["Cassini"], 
		PARAMETER["False_Easting", 30000.0], 
		PARAMETER["False_Northing", 30000.0], 
		PARAMETER["Central_Meridian", 103.8530022222222], 
		PARAMETER["Scale_Factor", 1.0], 
		PARAMETER["Latitude_Of_Origin", 1.287646666666667]], 
	CS[Cartesian, 2], 
	AXIS["Easting (X)", east, 
		ORDER[1]], 
	AXIS["Northing (Y)", north, 
		ORDER[2]], 
	LENGTHUNIT["Meter", 1.0], 
	ID["EPSG", "24500"]]

Data from @esri/proj-codes

{
  "wkid": 24500,
  "latestWkid": 24500,
  "gcsWkid": 4245,
  "macro": "PE_PCS_KERTAU_SINGAPORE_GRID",
  "name": "Kertau_Singapore_Grid",
  "wkt": "PROJCS[\"Kertau_Singapore_Grid\",GEOGCS[\"GCS_Kertau\",DATUM[\"D_Kertau\",SPHEROID[\"Everest_1830_Modified\",6377304.063,300.8017]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Cassini\"],PARAMETER[\"False_Easting\",30000.0],PARAMETER[\"False_Northing\",30000.0],PARAMETER[\"Central_Meridian\",103.8530022222222],PARAMETER[\"Scale_Factor\",1.0],PARAMETER[\"Latitude_Of_Origin\",1.287646666666667],UNIT[\"Meter\",1.0]]",
  "wkt2": "PROJCRS[\"Kertau_Singapore_Grid\",BASEGEOGCRS[\"GCS_Kertau\",DATUM[\"D_Kertau\",ELLIPSOID[\"Everest_1830_Modified\",6377304.063,300.8017]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Latitude (lat)\",north,ORDER[1]],AXIS[\"Longitude (lon)\",east,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433]],CONVERSION[\"Cassini\",METHOD[\"Cassini\"],PARAMETER[\"False_Easting\",30000.0],PARAMETER[\"False_Northing\",30000.0],PARAMETER[\"Central_Meridian\",103.8530022222222],PARAMETER[\"Scale_Factor\",1.0],PARAMETER[\"Latitude_Of_Origin\",1.287646666666667]],CS[Cartesian,2],AXIS[\"Easting (X)\",east,ORDER[1]],AXIS[\"Northing (Y)\",north,ORDER[2]],LENGTHUNIT[\"Meter\",1.0],ID[\"EPSG\",\"24500\"]]",
  "description": "Kertau Singapore Grid",
  "authority": "EPSG",
  "version": "6.11(8.0.1)",
  "deprecated": "no",
  "areaname": "Singapore",
  "extent": {
    "slat": 1.13,
    "nlat": 1.47,
    "llon": 103.59,
    "rlon": 104.07
  }
}