My collection of old instruments includes violins of the late 18th century
through the early 20th century.
I have paid significant attention to the authenticity and condition of these
instruments, at the time they were purchased.
The vast majority of them come with
highly reputable certificates, while the few that don't, are so
clearly representative of a maker,
that a certificate, though easily secured, might be considered unnecessary.
"Satisfaction guaranteed or full refund"