983. Exclusion of benefit.

In determining whether any property which is disposed of by way of gift1 is enjoyed to the entire exclusion, or virtually to the entire exclusion, of the donor and of any benefit to him by contract or otherwise2:


    (1)     in the case of property which is an interest in land3 or a chattel, retention or assumption by the donor of actual occupation of the land or actual enjoyment of an incorporeal right over the land, or actual possession of the chattel, is disregarded if it is for full consideration in money or money's worth4;


    (2)     in the case of