LP-550, LP-570
The difference between two models is only size of Buck body.
LP-570 is bigger than LP-550, it may be an improper expression LP-570 is for European, American. And LP-550 is for Asian people.

LP-550E, LP-570E
The difference between two models is only size of Buck body.
LP-570E is bigger than LP-550E, it may be an improper expression LP-570E is for European, American. And LP-550E is for Asian people.