Some questions -   Do some of you have marumune tachi or katana in your collections, what period/schools/makers are they thought to be if you have any information on them?   How steep is the curvature - that is, almost flat, rounded with max height about 1/2 the width of the mune (a circular radius), or a higher rounded oval?   I know this style is uncommon, so would appreciate any info.   thanks,   john