You'll find this at the Birkenhead Historical Society's museum here in Auckland. My friend and former President of the Society Ray Johanson casually pointed up at this shop sign placed above one of the cottage's exit signs one Sunday, and told me that this was from the Birkenhead dental surgery operated by Jean Batten's father, Frederick Harold Batten. He didn't have that great an impact on her life, so they say. He didn't approve of Jean's flying career, separated from his wife Ellen in 1920 (Jean lived with her mother from that point) and straight from serving in World War I Fred Batten set up practice in Birkenhead. During the war, according to the Auckland War Memorial Museum's Cenotaph database, Batten served as a Captain with the 28th Reinforcements E Company, embarking 14 July 1917. His wife Ellen was living in Devonport at the time. He appears to have died in 1967, aged 88, going by a quick look at the online BDMs.
There are photos of him online, via the Auckland City Library's website (Heritage Images), but mainly his only claim to any immortality in the infornation banks of history is that he fathered a very famous daughter.