EPSG:3850 - SWEREF99 / RT90 5 gon O emulation

{
  "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
  "type": "ProjectedCRS",
  "name": "SWEREF99 / RT90 5 gon O emulation",
  "base_crs": {
    "name": "SWEREF99",
    "datum": {
      "type": "GeodeticReferenceFrame",
      "name": "SWEREF99",
      "ellipsoid": {
        "name": "GRS 1980",
        "semi_major_axis": 6378137,
        "inverse_flattening": 298.257222101
      }
    },
    "coordinate_system": {
      "subtype": "ellipsoidal",
      "axis": [
        {
          "name": "Geodetic latitude",
          "abbreviation": "Lat",
          "direction": "north",
          "unit": "degree"
        },
        {
          "name": "Geodetic longitude",
          "abbreviation": "Lon",
          "direction": "east",
          "unit": "degree"
        }
      ]
    },
    "id": {
      "authority": "EPSG",
      "code": 4619
    }
  },
  "conversion": {
    "name": "RT90 zone 5 gon O emulation",
    "method": {
      "name": "Transverse Mercator",
      "id": {
        "authority": "EPSG",
        "code": 9807
      }
    },
    "parameters": [
      {
        "name": "Latitude of natural origin",
        "value": 0,
        "unit": "degree",
        "id": {
          "authority": "EPSG",
          "code": 8801
        }
      },
      {
        "name": "Longitude of natural origin",
        "value": 22.5563333333333,
        "unit": "degree",
        "id": {
          "authority": "EPSG",
          "code": 8802
        }
      },
      {
        "name": "Scale factor at natural origin",
        "value": 1.0000049,
        "unit": "unity",
        "id": {
          "authority": "EPSG",
          "code": 8805
        }
      },
      {
        "name": "False easting",
        "value": 1500121.846,
        "unit": "metre",
        "id": {
          "authority": "EPSG",
          "code": 8806
        }
      },
      {
        "name": "False northing",
        "value": -672.557,
        "unit": "metre",
        "id": {
          "authority": "EPSG",
          "code": 8807
        }
      }
    ]
  },
  "coordinate_system": {
    "subtype": "Cartesian",
    "axis": [
      {
        "name": "Northing",
        "abbreviation": "X",
        "direction": "north",
        "unit": "metre"
      },
      {
        "name": "Easting",
        "abbreviation": "Y",
        "direction": "east",
        "unit": "metre"
      }
    ]
  },
  "scope": "User-defined CRS in GPS receiver.",
  "area": "Sweden - east of approximately 21°26'E. See information source for map.",
  "bbox": {
    "south_latitude": 65.24,
    "west_longitude": 21.34,
    "north_latitude": 68.58,
    "east_longitude": 24.17
  },
  "id": {
    "authority": "EPSG",
    "code": 3850
  }
}

{'crs_wkt': 'PROJCRS["SWEREF99 / RT90 5 gon O '
            'emulation",BASEGEOGCRS["SWEREF99",DATUM["SWEREF99",ELLIPSOID["GRS '
            '1980",6378137,298.257222101,LENGTHUNIT["metre",1]]],PRIMEM["Greenwich",0,ANGLEUNIT["degree",0.0174532925199433]],ID["EPSG",4619]],CONVERSION["RT90 '
            'zone 5 gon O emulation",METHOD["Transverse '
            'Mercator",ID["EPSG",9807]],PARAMETER["Latitude of natural '
            'origin",0,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8801]],PARAMETER["Longitude '
            'of natural '
            'origin",22.5563333333333,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8802]],PARAMETER["Scale '
            'factor at natural '
            'origin",1.0000049,SCALEUNIT["unity",1],ID["EPSG",8805]],PARAMETER["False '
            'easting",1500121.846,LENGTHUNIT["metre",1],ID["EPSG",8806]],PARAMETER["False '
            'northing",-672.557,LENGTHUNIT["metre",1],ID["EPSG",8807]]],CS[Cartesian,2],AXIS["northing '
            '(X)",north,ORDER[1],LENGTHUNIT["metre",1]],AXIS["easting '
            '(Y)",east,ORDER[2],LENGTHUNIT["metre",1]],USAGE[SCOPE["User-defined '
            'CRS in GPS receiver."],AREA["Sweden - east of approximately '
            "21°26'E. See information source for "
            'map."],BBOX[65.24,21.34,68.58,24.17]],ID["EPSG",3850]]',
 'false_easting': 1500121.846,
 'false_northing': -672.557,
 'geographic_crs_name': 'SWEREF99',
 'grid_mapping_name': 'transverse_mercator',
 'horizontal_datum_name': 'SWEREF99',
 'inverse_flattening': 298.257222101,
 'latitude_of_projection_origin': 0.0,
 'longitude_of_central_meridian': 22.556333333333335,
 'longitude_of_prime_meridian': 0.0,
 'prime_meridian_name': 'Greenwich',
 'projected_crs_name': 'SWEREF99 / RT90 5 gon O emulation',
 'reference_ellipsoid_name': 'GRS 1980',
 'scale_factor_at_central_meridian': 1.0000049,
 'semi_major_axis': 6378137.0,
 'semi_minor_axis': 6356752.314140356}