Based design is radiated gourd - "Hyoutan".
Main Logo is Guide of th water road - "Miotsukushi".
And sub logo is NTT's Logo.
NTT is Nippon Telegraph and Telephone Corporation.
This is alos fairly old Aratama Suidou cover of "Doro Haki Room".
"Doro Haki" means "clean up mud from sewarage pipe", may-be.
"Aratama Suidou" is ancient plumber company.