TM75 Irish Grid - EPSG:29903

WKT

PROJCS["TM75_Irish_Grid", 
	GEOGCS["GCS_TM75", 
		DATUM["D_TM75", 
			SPHEROID["Airy_Modified", 6377340.189, 299.3249646]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	PROJECTION["Transverse_Mercator"], 
	PARAMETER["False_Easting", 200000.0], 
	PARAMETER["False_Northing", 250000.0], 
	PARAMETER["Central_Meridian", -8.0], 
	PARAMETER["Scale_Factor", 1.000035], 
	PARAMETER["Latitude_Of_Origin", 53.5], 
	UNIT["Meter", 1.0]]

WKT2

PROJCRS["TM75_Irish_Grid", 
	BASEGEOGCRS["GCS_TM75", 
		DATUM["D_TM75", 
			ELLIPSOID["Airy_Modified", 6377340.189, 299.3249646]], 
		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", 200000.0], 
		PARAMETER["False_Northing", 250000.0], 
		PARAMETER["Central_Meridian", -8.0], 
		PARAMETER["Scale_Factor", 1.000035], 
		PARAMETER["Latitude_Of_Origin", 53.5]], 
	CS[Cartesian, 2], 
	AXIS["Easting (X)", east, 
		ORDER[1]], 
	AXIS["Northing (Y)", north, 
		ORDER[2]], 
	LENGTHUNIT["Meter", 1.0], 
	ID["EPSG", "29903"]]

Data from @esri/proj-codes

{
  "wkid": 29903,
  "latestWkid": 29903,
  "gcsWkid": 4300,
  "macro": "PE_PCS_TM75_IRISH_GRID",
  "name": "TM75_Irish_Grid",
  "wkt": "PROJCS[\"TM75_Irish_Grid\",GEOGCS[\"GCS_TM75\",DATUM[\"D_TM75\",SPHEROID[\"Airy_Modified\",6377340.189,299.3249646]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",200000.0],PARAMETER[\"False_Northing\",250000.0],PARAMETER[\"Central_Meridian\",-8.0],PARAMETER[\"Scale_Factor\",1.000035],PARAMETER[\"Latitude_Of_Origin\",53.5],UNIT[\"Meter\",1.0]]",
  "wkt2": "PROJCRS[\"TM75_Irish_Grid\",BASEGEOGCRS[\"GCS_TM75\",DATUM[\"D_TM75\",ELLIPSOID[\"Airy_Modified\",6377340.189,299.3249646]],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\",200000.0],PARAMETER[\"False_Northing\",250000.0],PARAMETER[\"Central_Meridian\",-8.0],PARAMETER[\"Scale_Factor\",1.000035],PARAMETER[\"Latitude_Of_Origin\",53.5]],CS[Cartesian,2],AXIS[\"Easting (X)\",east,ORDER[1]],AXIS[\"Northing (Y)\",north,ORDER[2]],LENGTHUNIT[\"Meter\",1.0],ID[\"EPSG\",\"29903\"]]",
  "description": "TM75 Irish Grid",
  "authority": "EPSG",
  "version": "5.3(9.0.0)",
  "deprecated": "no",
  "areaname": "Europe - Ireland (Republic and Ulster) - onshore",
  "extent": {
    "slat": 51.39,
    "nlat": 55.43,
    "llon": -10.56,
    "rlon": -5.34
  }
}