Sorry, can't help you with that.
Someone else on the forum perhaps?
Maybe you could ask Honda Japan...
I believe they were only in production from 1969 to 1972.
Of course, some of them were sold an brought in traffic years later.
Afterwards, the Honda NT (12v) version had a 'white dax' which had only... a white color and different frame stickers (black and red, if I remember correclt) but fitted with standard seat.