Campo & Campo, Belgium, sells on 29 November 2016 an "Old Master, 16th century" Mocking of Christ, a rather large (107 by 71 cm) oil on panel without an estimate.
The auction catalogue adds that it was described as "Derick Baegert" at a previous sale in 1969. It is not really a Mocking of Christ, more a Crowning of Thorns, with the Flagellation in the background.
It is a work of considerable quality, but hard to put a precise name on it. I have discussed the iconography in a previous post (where I rather stupidly noticed the mechanism to put the crown of thorns on the head of Christ for the first time, even though it is standard in these paintings). This time, the addition of the Flagellation in the background is a bonus, but not a unique invention.
What's it worth? 8,000 to 10,000 Euro says my gut instinct.