Based on a conventional key ring with its corresponding ring, or any other closure (1) and ornamental head (2), the inventions implies said head (2) bearing a currency conversion table, such as from Euros to Pesetas, or any currency, suitably printed on head (2), and in addition to said conversion table (3) a housing (7) which allows attachment and removal of a coin, token or the like (8), for which purpose housing (7) is provided with two side arms (6) which may be elastically deformed and which slightly strangle the opening of housing (7), retaining the coin, token or the like inside it in a stable position.