CoreStates Financial Corp has acquired a 20% stake in the Mexican  currency exchange house Vectodivisas, a spokeswoman for the bank confirmed. 
The Philadelphia-based banking company declined to disclose how much it  is paying for the acquisition, which was made through a subsidiary,   Philadephia International Equities Inc.   
  
The stake one of several CoreStates has acquired over the years as part  of a bid to build strategic alliances with useful partners. 
Since the late 1960's, CoreStates has acquired minority stakes of from  5% to 20% in Banco Internacional de Panama, Germany's Joh. Berenberg,   Gossler & Co., South Korea's Hana Bank, and Austria's Internationale Bank   fur Aussenhandel AG.