I just discovered that a G1 Hound figure that I purchased for parts quite a while back has the takara circle marking w/no date (as on diaclone/pre-transformer figures) where the G1 figure has the takara japan 1980-82. Would this indicate that this is in fact a diaclone jeep and not a G1 Hound? I'm confused with the date stamps, as I do also own a GiG Auto Robot pre-Transformer Jazz and it is marked takara 1980-1982. Is there a resource I can go to for these stamps and how to use them to identify transformer related toys by line/origin? Thanks for any help anyone can provide.