This is a Tillotson Model F1B Carburetor for a 1928-31 Model A Ford. This is a bolt on replacement for the Original Zenith carbs and was Touted as increasing performance. This Carburetor is in Good Condition. The Choke & Throttle Levers move Freely. The Threads to Bolt to the Intake are Good and have been tested. This is a Great Candidate for Rebuilding/Restoring. The (24) Pics show the Condition of the Carburetor Very Well. PLEASE CHECK OUT MY OTHER CARBURETORS & LISTINGS.