Oh ok.. A Buddhist symbol..had not seen a maedate featuring that symbol anywhere and it had me stumped..thank you! The seller had stated he believed the maedate was a later addition to the set.
Uwe..thanks very much for the info re kanji! I guess id really like an opinion on the completeness and period of the set? Was sold as a complete matching mid to late Edo period Armour with no additions..does this appear to be the case from the pictures I can provide? Is there anything particular that points to this in style or build? It seems a very basic kabuto and not everyones cup of tea but something appeals to me about the entirety..