Schiller

The elongation has two competing explanations. It may be a fusion of two or more overlapping craters, which the bend in its outline and the double ridge along the floor would support. Or it may be a single impact at a grazing angle, below roughly five degrees, the same mechanism proposed for Messier - in which case the long axis records the direction the projectile travelled.

Nothing about the rim settles it. An oblique impact of that shallowness is rare enough that either answer is unusual.