1930 United States Federal Census

Validator (claude-sonnet-5-5, 2026-10-28): consistent, confidence 2/4, tier record.
Lines 46-47 show James Taubr, 54, carpenter on the railroad, born Bohemia, immigrated 1901, with wife Frances, 54. This fits a Bohemian-born man of about the right age, assuming James is Václav. The census cannot confirm the exact birth date or place, and the age is about a year off, so it is only weak, consistent support for the birth claim.
Matches: Household of James Taubr/Tauber, head, age 54, born Bohemia (father and mother also Bohemia), on lines 46-47 of the image; Age 54 implies a birth around 1875-1876, which is close to the claimed 1876; Wife Frances, 54, born Bohemia; immigrated 1901; mother tongue Bohemian; Name Václav is commonly anglicized as James, which fits when other details match
Flags: The census names him James, not Václav or Wenzel, so the identification rests on assuming an anglicized name; Age 54 on 1 April 1930 would give a birth between April 1875 and April 1876. The claimed 17 Nov 1876 would make him 53, so this is a possible one-year discrepancy.
Limits: A census gives an age and a country of birth only, not a birth date or town, so it cannot confirm 17 November 1876 or Mostiště, Rokycany; The record does not name Václav, so it cannot show that James is Václav Tauber; Handwriting is small and the ages are only moderately legible; Whether this household is the claimed person's family depends on other evidence, such as the wife's name and the children