In the same year it was subjected to a dendro-chronological examination by John C. Topham, England, which dates the latest year-rings from 1659 and proves a perfect cross-match with wood used by contemporaries Sanctus Serafin and Antonio Stradivari.
The flat back is made of two pieces of Italian ash, with original wings added.
The head is made of plain maple, cut similarly as scrolls of smaller instruments known of this maker.
Late 2010 the instrument was acquired by a chamber-music lover and investor, who generously has given it to Dutch double bassist Niek de Groot, as a lifelong loan.
Since 2016 the bass is played by Kenneth Ryland solo double bassist of the Oslo Philharmonic Orchestra.