EPSG:7406 — NAD27 + NGVD29 height (ftUS)

COMPOUNDCRS[
    "NAD27 + NGVD29 height (ftUS)",
    GEOGCRS[
        "NAD27",
        DATUM[
            "North American Datum 1927",
            ELLIPSOID[
                "Clarke 1866",
                6378206.4,
                294.978698213898,
                LENGTHUNIT["metre",1,ID["EPSG",9001]],
                ID["EPSG",7008]
            ],
            ID["EPSG",6267]
        ],
        CS[ellipsoidal,2,ID["EPSG",6422]],
        AXIS["Geodetic latitude (Lat)",north],
        AXIS["Geodetic longitude (Lon)",east],
        ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
        ID["EPSG",4267]
    ],
    VERTCRS[
        "NGVD29 height (ftUS)",
        VDATUM["National Geodetic Vertical Datum 1929",ID["EPSG",5102]],
        CS[vertical,1,ID["EPSG",6497]],
        AXIS["Gravity-related height (H)",up],
        LENGTHUNIT["US survey foot",0.304800609601219,ID["EPSG",9003]],
        ID["EPSG",5702]
    ],
    ID["EPSG",7406]
]

+proj=longlat +datum=NAD27 +vunits=us-ft +no_defs +type=crs

proj4.defs("EPSG:7406", "+proj=longlat +datum=NAD27 +vunits=us-ft +no_defs +type=crs");

{
  "type": "CoordinateReferenceSystem",
  "code": 7406,
  "name": "NAD27 + NGVD29 height (ftUS)",
  "kind": "compound",
  "area": "USA - CONUS - onshore",
  "unit": null,
  "bbox": [
    24.41,
    -124.79,
    49.38,
    -66.91
  ],
  "proj4": "+proj=longlat +datum=NAD27 +vunits=us-ft +no_defs +type=crs"
}

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (7406, 'EPSG', 7406, '+proj=longlat +datum=NAD27 +vunits=us-ft +no_defs +type=crs', 'COMPD_CS["NAD27 + NGVD29 height (ftUS)",GEOGCS["NAD27",DATUM["North_American_Datum_1927",SPHEROID["Clarke 1866",6378206.4,294.978698213898,AUTHORITY["EPSG","7008"]],AUTHORITY["EPSG","6267"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4267"]],VERT_CS["NGVD29 height (ftUS)",VERT_DATUM["National Geodetic Vertical Datum 1929",2005,AUTHORITY["EPSG","5102"]],UNIT["US survey foot",0.304800609601219,AUTHORITY["EPSG","9003"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","5702"]],AUTHORITY["EPSG","7406"]]');

PROJECTION
  "+proj=longlat"
  "+datum=NAD27"
  "+vunits=us-ft"
  "+no_defs"
  "+type=crs"
END

7406=COMPD_CS["NAD27 + NGVD29 height (ftUS)",GEOGCS["NAD27",DATUM["North_American_Datum_1927",SPHEROID["Clarke 1866",6378206.4,294.978698213898,AUTHORITY["EPSG","7008"]],AUTHORITY["EPSG","6267"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4267"]],VERT_CS["NGVD29 height (ftUS)",VERT_DATUM["National Geodetic Vertical Datum 1929",2005,AUTHORITY["EPSG","5102"]],UNIT["US survey foot",0.304800609601219,AUTHORITY["EPSG","9003"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","5702"]],AUTHORITY["EPSG","7406"]]