Butter knife

I got a bunch of different random butter knife’s in my silverware drawer. but I only have one of them through the years of use it has become my favorite butter knife out of the ones I own. I don’t know much about it but I happened to look on eBay for more of them and actually found some more of them so I bought them. They are stamped Japan on the handle and was wondering if any body knew anything about them? Besides they were made in Japan. I didn’t know they were even called pistol grips I thought it was a teardrop shape but they do feel nice in hand. The ergonomics and weight and balance are nice with the one I own. I hope the ones I bought are the same. Thanks if you got any info on these awesome butter knife’s let me know I would appreciate it.