US Navy Button Collection, Belt Buckle, and Some brass thingys

Ok, so yeah, the “thingys” are also belt buckle parts.  Might even be for US Marines Dress Blues.  Not too sure, but they are parts for a belt buckle.  The brass open faced buckle has been in service since WWII.  These could be as old at Vietnam era, again, can’t be positive.  Bought at an estate sale, and there are more buttons than on one jacket.  Also some dress cap studs in there too.  Nice assortment, and one black USN button to boot.  Yeah, pun intended.