having worked with this guide for some weeks, I recommend it ....
the foreign mail section has been audited , bringing forward new indicia from the Nishino study ... for telegraph enthusiasts, this section has been expanded greatly ... the small double-circle cancels are a fine way to represent kobans ...
this is not a price guide : but aids research. I relate my koban imitation study constantly ... defining the imitation indicia. the graphs show section 322 : foreign mail - by PO and year ...