However, Tinker's logbook suggests that he claimed 19 victories, which would make him the sixth-highest scoring pilot in FARE.
That relatively few of his claims were officially recognized was due to the complex system of verifying air kills used by FARE and the financial incentive paid to mercenaries: many victories were not verifiable because the downed aircraft crashed in an enemy-held area and/or an incentive would not have to be paid.
In addition, Tinker and other pilots from Escuadrilla La Calle ("La Calle's Squadron"), also known as 1ª Escuadrilla de Chatos (1st Chato Squadron"), shared a number of joint kills against Junkers Ju 52 bombers.
He reported narrowly avoiding death at both the hands of enemy aviators and malfunctioning equipment.
He left a detailed record of his experiences as a fighter pilot for the Republicans in his memoir Some Still Live, published by Funk & Wagnalls Co in New York, 1938 and recently republished by The Clapton Press, London.