GSK-2011 - EPSG:7683

WKT

GEOGCS["GSK-2011", 
	DATUM["Geodezicheskaya_Sistema_Koordinat_2011", 
		SPHEROID["GSK-2011", 6378136.5, 298.2564151]], 
	PRIMEM["Greenwich", 0.0], 
	UNIT["Degree", 0.0174532925199433]]

WKT2

GEOGCRS["GSK-2011", 
	DATUM["Geodezicheskaya_Sistema_Koordinat_2011", 
		ELLIPSOID["GSK-2011", 6378136.5, 298.2564151]], 
	PRIMEM["Greenwich", 0.0], 
	CS[ellipsoidal, 2], 
	AXIS["Latitude (lat)", north, 
		ORDER[1]], 
	AXIS["Longitude (lon)", east, 
		ORDER[2]], 
	ANGLEUNIT["Degree", 0.0174532925199433], 
	ID["EPSG", "7683"]]

Data from @esri/proj-codes

{
  "wkid": 7683,
  "latestWkid": 7683,
  "macro": "PE_GCS_GSK_2011",
  "name": "GSK-2011",
  "wkt": "GEOGCS[\"GSK-2011\",DATUM[\"Geodezicheskaya_Sistema_Koordinat_2011\",SPHEROID[\"GSK-2011\",6378136.5,298.2564151]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]]",
  "wkt2": "GEOGCRS[\"GSK-2011\",DATUM[\"Geodezicheskaya_Sistema_Koordinat_2011\",ELLIPSOID[\"GSK-2011\",6378136.5,298.2564151]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Latitude (lat)\",north,ORDER[1]],AXIS[\"Longitude (lon)\",east,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433],ID[\"EPSG\",\"7683\"]]",
  "description": "GSK-2011",
  "authority": "EPSG",
  "version": "9.0(10.5.1)",
  "deprecated": "no",
  "areaname": "Russia",
  "extent": {
    "slat": 39.87,
    "nlat": 85.19,
    "llon": 18.92,
    "rlon": -168.97
  }
}