HTRS07 - ESRI:104048

WKT

GEOGCS["HTRS07", 
	DATUM["Hellenic_Terrestrial_Reference_System_2007", 
		SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
	PRIMEM["Greenwich", 0.0], 
	UNIT["Degree", 0.0174532925199433]]

WKT2

GEOGCRS["HTRS07", 
	DATUM["Hellenic_Terrestrial_Reference_System_2007", 
		ELLIPSOID["GRS_1980", 6378137.0, 298.257222101]], 
	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", "104048"]]

Data from @esri/proj-codes

{
  "wkid": 104048,
  "latestWkid": 104048,
  "macro": "PE_GCS_HTRS07",
  "name": "HTRS07",
  "wkt": "GEOGCS[\"HTRS07\",DATUM[\"Hellenic_Terrestrial_Reference_System_2007\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]]",
  "wkt2": "GEOGCRS[\"HTRS07\",DATUM[\"Hellenic_Terrestrial_Reference_System_2007\",ELLIPSOID[\"GRS_1980\",6378137.0,298.257222101]],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\",\"104048\"]]",
  "description": "HTRS07",
  "authority": "Esri",
  "version": "13.6.0",
  "deprecated": "no",
  "areaname": "Greece",
  "extent": {
    "slat": 33.26,
    "nlat": 41.75,
    "llon": 18.26,
    "rlon": 30.23
  }
}