USA - conus - EPSG:7406

WKT

HVCOORDSYS["HVC_NAD27_and_NGVD29_Height", 
	GEOGCS["GCS_North_American_1927", 
		DATUM["D_North_American_1927", 
			SPHEROID["Clarke_1866", 6378206.4, 294.9786982]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	VERTCS["NGVD_1929", 
		VDATUM["National_Geodetic_Vertical_Datum_1929"], 
		PARAMETER["Vertical_Shift", 0.0], 
		PARAMETER["Direction", 1.0], 
		UNIT["Foot_US", 0.3048006096012192]]]

WKT2

COMPOUNDCRS["HVC_NAD27_and_NGVD29_Height", 
	GEOGCRS["GCS_North_American_1927", 
		DATUM["D_North_American_1927", 
			ELLIPSOID["Clarke_1866", 6378206.4, 294.9786982]], 
		PRIMEM["Greenwich", 0.0], 
		CS[ellipsoidal, 2], 
		AXIS["Latitude (lat)", north, 
			ORDER[1]], 
		AXIS["Longitude (lon)", east, 
			ORDER[2]], 
		ANGLEUNIT["Degree", 0.0174532925199433]], 
	VERTCRS["NGVD_1929", 
		VDATUM["National_Geodetic_Vertical_Datum_1929"], 
		CS[vertical, 1], 
		AXIS["Gravity-related height (H)", up, 
			LENGTHUNIT["Foot_US", 0.3048006096012192]]], 
	ID["EPSG", "7406"]]

Data from @esri/proj-codes

{
  "wkid": 7406,
  "latestWkid": 7406,
  "pcsWkid": 0,
  "gcsWkid": 4267,
  "vcsWkid": 5702,
  "macro": "PE_HVC_NAD27_AND_NGVD29_HEIGHT",
  "name": "HVC_NAD27_and_NGVD29_Height",
  "wkt": "HVCOORDSYS[\"HVC_NAD27_and_NGVD29_Height\",GEOGCS[\"GCS_North_American_1927\",DATUM[\"D_North_American_1927\",SPHEROID[\"Clarke_1866\",6378206.4,294.9786982]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],VERTCS[\"NGVD_1929\",VDATUM[\"National_Geodetic_Vertical_Datum_1929\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Foot_US\",0.3048006096012192]]]",
  "wkt2": "COMPOUNDCRS[\"HVC_NAD27_and_NGVD29_Height\",GEOGCRS[\"GCS_North_American_1927\",DATUM[\"D_North_American_1927\",ELLIPSOID[\"Clarke_1866\",6378206.4,294.9786982]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Latitude (lat)\",north,ORDER[1]],AXIS[\"Longitude (lon)\",east,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433]],VERTCRS[\"NGVD_1929\",VDATUM[\"National_Geodetic_Vertical_Datum_1929\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Foot_US\",0.3048006096012192]]],ID[\"EPSG\",\"7406\"]]",
  "description": "USA - conus",
  "authority": "EPSG",
  "version": "6.15(10.0.0)",
  "deprecated": "no",
  "areaname": "USA - CONUS - onshore",
  "extent": {
    "slat": 24.41,
    "nlat": 49.38,
    "llon": -124.79,
    "rlon": -66.91
  }
}