Suzanne ,
every double triggered SxS isn't a Centaure.
The Centaure I had , had the Man/Bulls likeness stamped on the top of each bbl up near the breech.
Can you post any pics, to see how nice the swirly lines are?[mine had very few
There should be a alphabet letter on one of the flat parts where the barrels close with the action...if you let us know , I or another can date it .
Pics would give better guess at value
cheers
Franc