The current MT chips being offered on ebay are reproductions.

The original Mother Tucker brass core chips are oversized 43mm ... the repros are 39mm ceramic.

The original Mother Tucker chips can be readily identified on one side with an Edw. S. Forte' Enterprise brass core (see image below). There is no such S. Forte Ent mention on the repros.

The repros were made by DB Promotions in Virgina... quantity unknown.

There are only 13 sets known of the original Mother Tucker chips, which sold in the $40-$50 range for each chip.