Often it is helpful to use a database to help identify a lever lock; these usually also indicate suitable methods of opening.
? What do you mean by that? I'm eagerly looking for that database, showing suitable methods for opening.

I agree with the restrictive keyway part. Even lower quality European locks tend to have paracentric keyways. Not to mention better Euro manufacturers like EVVA or the GEGE, GERA.
I've found lever locks are primarily used in Italy and Great Britain. I have rarely seen them in eastern Europe or in german speaking countries.
(apart from of course safe lock and stuff like that, but we're talking about door locks, right?)
(BTW this is the week of necromancers right?

This it the 2nd or 3rd thread which got recently revived after many years.

)