Original: Du Pré primarily played two Stradivarius cellos, the instrument of 1673 (now called the "du Pré Stradivarius"), and the 1712 Davidov Stradivarius.
Simplified: One was a Stradivari cellos, the Stradivarius made in 1673, and the other was made in 1712 and was called the Davydov Stradivarius.