8) as far as i know, there are 3 theories known in the world of tokai guitars today. the first one is originally told by TOGPS of this forum. the german tokai dealer. that X=Y means month=day. this theory is commonly the most believed on this forum for many years. the second one is X=Y means month=lot#. this is by peter mac of this forum. more informations are on his new tokai book i guess. the third one is X=Y means CNCrouter-pattern=production lot#. this is the information from mr.kunishi furuhashi, interviewed by me. mr.kunishi furuhashi is the old tokai company people and so he almost knows everything about those tokai golden era. he only told me the infomation unclearly because the information is the company's secret. mr.furuhashi sure seems to know the truth. these 3 theories are known today but nobody is really sure what is the truth. the real information of that tokai X=Y stamps. hopefully someday somebody gets the real answer so we can then be truely happy and rest. if i get any more chances to ask about the stamp info to any old tokai company people then i will surely. until then, we can only believe all those 3 theories. i might have made mistakes on this post so if i did, then forgive me. sometimes i am kinda unclear about the tokai guitar infomations. hope this helps. joey hamamatsu.