Mismatched trigger value

[Edward Tinker]

A mismatched trigger would bother me, not as much as a toggle or sideplates.

Being same number but Erfurt stamp gives only a couple of possibilities to me;
a lucky find by a previous owner
in the unit a same matching number was swapped accidentally
a rework using a blank but accepted Erfurt part or an Erfurt part that was numbered that way already...