The Tudor Advisor was first introduced in 1957 with the reference 7926, which was in production until 1968 when it was replaced by the reference 10050. This 7926 is powered by the Adolph Schild manual-winding caliber 1475 with alarm function. The Ref. 7926 was the first Tudor Advisor. Whilst the Cricket and Memovox used a case with two backs to amplify sound, the Advisor used an adapted Rolex Oyster case. Unusually for an Oyster case, neither of the crowns are signed with the iconic Rolex coronet. It is 34mm in diameter.