Hamdi's 1906 painting, "The Tortoise Trainer", has held the record until 2019 for the most valuable Turkish painting, after being sold for 5 million Turkish Liras (approx. US$3.5 million) in December 2004. At the 2004 Artam Antik A.Ç. auction in Istanbul, the Pera Museum and the Turkish Modern Museum fought to acquire the painting, and was ultimately purchased by the Pera Museum. The painting depicts Hamdi's likeness clad in antiquated clothing, training tortoises in a mosque. This choice of subject matter leads many to see this painting as a commentary on Turkey's conflicted national identity. The painting expresses a sarcastic innuendo on the painter's own view of his style of work compared to those of his collaborators and apprentices, and is also a reference to the historical fact of tortoises having been employed for illuminating and decorative purposes, by placing candles on the shell, in evening outings during the Tulip Era in the early 18th century. The painting was acquired by the Suna and İnan Kıraç Foundation and is currently on display at the Pera Museum in İstanbul, which was established by this foundation. His "Girl Reciting Qur'an" (1880) broke the record by realizing US$7.8 million at a Bonhams auction in September 2019.