The article is focused on a presentation of 16 silver calyxes owned by Mr. Piotr Maciej Przypkowski. These objects are adorned with various coins: ancient Roman (4), medieval (3), and modern (9). In addition to the coins, each vessel has Latin (12) and Polish (4) maxims as well as alchemic and astrological symbols under its rim. This is very likely the latest, attested in numismatic literature, example of historical coins being reused as decorative elements of vessels.

The paper analyses the consequences of structural change in the presenceof non-stationary stochastic processes I(1) or I(2). The structural change mayconcern the deterministic structure (in particular, the trend and the constantterm) as well as the process generating the stochastic part. The focus of thepaper is on the case of a discrete change in a regime for which the momentof switch is known. A change in the deterministic part does not alter thecharacter of the cointegration relationships but its consequences for cotrendingand cobreaking are interesting. The consequences of a change in the stochasticpart are more complex, because then the stochastic process as well as thedeterministic structure of the VECM are modified. The restrictions are analysedfor both cases.