Up for sale is a NEW Vacuum Advance Chamber for the ignition distributor.  Replaces GM # 1909343.  We have a couple of these available, so the one you receive may look slightly different than the photos but will be in the same NEW condition.  This will fit the following:

1952 Chevrolet Passenger Cars - all models with 6-cylinder engine

1953 Chevrolet Sedan Delivery with 6-cylinder engine