Small display case lock
Side view. Sort of like a long KIK cylinder. That tab on the back end is what is turned with the plug to allow removal of the lock.
The key looks sort of like three sides of a cruciform lock, but only has pins on the top edge. The angles at the front of the keyway make fitting a tension wrench rather difficult.
oh, did I mention that unlike the Scandinavian Jail lock, this one is a little bit smaller? That is my smallest finger next to the key.
Gordon