Stereo 1970 - EPSG:31700

WKT

PROJCS["Stereo_70", 
	GEOGCS["GCS_Dealul_Piscului_1970", 
		DATUM["D_Dealul_Piscului_1970", 
			SPHEROID["Krasovsky_1940", 6378245.0, 298.3]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	PROJECTION["Double_Stereographic"], 
	PARAMETER["False_Easting", 500000.0], 
	PARAMETER["False_Northing", 500000.0], 
	PARAMETER["Central_Meridian", 25.0], 
	PARAMETER["Scale_Factor", 0.99975], 
	PARAMETER["Latitude_Of_Origin", 46.0], 
	UNIT["Meter", 1.0]]

WKT2

PROJCRS["Stereo_70", 
	BASEGEOGCRS["GCS_Dealul_Piscului_1970", 
		DATUM["D_Dealul_Piscului_1970", 
			ELLIPSOID["Krasovsky_1940", 6378245.0, 298.3]], 
		PRIMEM["Greenwich", 0.0], 
		CS[ellipsoidal, 2], 
		AXIS["Latitude (lat)", north, 
			ORDER[1]], 
		AXIS["Longitude (lon)", east, 
			ORDER[2]], 
		ANGLEUNIT["Degree", 0.0174532925199433]], 
	CONVERSION["Double_Stereographic", 
		METHOD["Double_Stereographic"], 
		PARAMETER["False_Easting", 500000.0], 
		PARAMETER["False_Northing", 500000.0], 
		PARAMETER["Central_Meridian", 25.0], 
		PARAMETER["Scale_Factor", 0.99975], 
		PARAMETER["Latitude_Of_Origin", 46.0]], 
	CS[Cartesian, 2], 
	AXIS["Northing (Y)", north, 
		ORDER[1]], 
	AXIS["Easting (X)", east, 
		ORDER[2]], 
	LENGTHUNIT["Meter", 1.0], 
	ID["EPSG", "31700"]]

Data from @esri/proj-codes

{
  "wkid": 31700,
  "latestWkid": 31700,
  "gcsWkid": 4317,
  "macro": "PE_PCS_DEALUL_PISCULUI_1970_STEREO_70",
  "name": "Stereo_70",
  "wkt": "PROJCS[\"Stereo_70\",GEOGCS[\"GCS_Dealul_Piscului_1970\",DATUM[\"D_Dealul_Piscului_1970\",SPHEROID[\"Krasovsky_1940\",6378245.0,298.3]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Double_Stereographic\"],PARAMETER[\"False_Easting\",500000.0],PARAMETER[\"False_Northing\",500000.0],PARAMETER[\"Central_Meridian\",25.0],PARAMETER[\"Scale_Factor\",0.99975],PARAMETER[\"Latitude_Of_Origin\",46.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "PROJCRS[\"Stereo_70\",BASEGEOGCRS[\"GCS_Dealul_Piscului_1970\",DATUM[\"D_Dealul_Piscului_1970\",ELLIPSOID[\"Krasovsky_1940\",6378245.0,298.3]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Latitude (lat)\",north,ORDER[1]],AXIS[\"Longitude (lon)\",east,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433]],CONVERSION[\"Double_Stereographic\",METHOD[\"Double_Stereographic\"],PARAMETER[\"False_Easting\",500000.0],PARAMETER[\"False_Northing\",500000.0],PARAMETER[\"Central_Meridian\",25.0],PARAMETER[\"Scale_Factor\",0.99975],PARAMETER[\"Latitude_Of_Origin\",46.0]],CS[Cartesian,2],AXIS[\"Northing (Y)\",north,ORDER[1]],AXIS[\"Easting (X)\",east,ORDER[2]],LENGTHUNIT[\"Meter\",1.0],ID[\"EPSG\",\"31700\"]]",
  "description": "Stereo 1970",
  "authority": "EPSG",
  "version": "2.1(4.0.0)",
  "deprecated": "no",
  "areaname": "Romania",
  "extent": {
    "slat": 43.44,
    "nlat": 48.27,
    "llon": 20.26,
    "rlon": 31.41
  }
}