Have seen this somewhat unique variant of the clasped hands Sarute over the years and always wondered what (if any) significance they held. My observations have noted the following:
tend to be present on good quality Koshirae
a few have been on Suya Shoten marked Koshirae
If you own (or have pictures) of swords with this type of Sarute could you please share them? Ideally noting if they had original rank tassels, bear any maker stamps or have any other feature