Struise Tsjeeses Reserva?

The 11 isn't a vintage - it merely denotes that it's the 11th beer ever made by De Struise.

To determine the vintage you need to consult the best before date. I believe the vintage will either be 4 or 5 years ahead of the BB Date. Depending on whether it's a 2012 or pre-2012 bottle will determine whether its Bourbon or unspecified 'oak barrels'.

Edit: If the best before is 26-12-2017, it is this year's Bourbon version. If it is something else it's from 2011 or earlier.

 

There seems to be some difference between bottles from Europe and those that came through Shelton Bros. I'm fairly certain that this is the new one though. The 2011 denotes the vintage of the base beer, even though the Reserva is released in 2012.

 

Alright - did some research:

Tsjeeses Reserva Bourbon - Pink & Purple label
European label: BB 26-12-2017 (you'll have this if you bought it in Europe or from Etre Gourmet, etc.)
American label: Should say Tsjeeses Reserva 2011.

Tsjeeses Reserva (2010 & earlier - unspecified oak barrels) - Pink & Purple label
There are a few vintages and depending on where you bought your bottle geographically there are a number of codes. The two most common are:
Lot C - 8 - 10
Lot B - BB 12/12/2012

 

This looks like the 2010 vintage. The BB is usually 5 years from bottling, so this was bottled in June 2011 meaning it was the 2010 vintage of Tsjeeses that was aged on oak for 6 months.

 

Pannepot is the original beer.
Pannepeut is a different recipe that was originally for Ølbutikken - less spices. It was originally called Pannepøt, but that led to mass confusion in inventory systems not equipped to handle foreign characters (and ignorant/less-discerning customers and store owners).
Pannepot Reserva is Pannepot aged in wine barrels (possibly second or third use bourbon too).
Pannepot Grand Reserva is aged further in Calvados barrels.
Pannepot Special Reserva was aged in port barrels.
Pannepot Wild was exposed to wild yeast.