Hardly an answer but you might find the following worth the read.
[
www.maxrod.net]
I'll cut and paste this too
"Yes, Tosaku is a well known name in Japanese bamboo rod making history. I have read that as many as 26 brand names were attached to bamboo fly rods and other bamboo rods made in occupied Japan following WW II. Some of these rods are undoubtedly of better quality than others. Most were high production rods and sold for $2 or so to US servicemen stationed in Japan. Thousands of these rods found their way to the USA as gifts or as souvenirs for the servicemen. Many were used as everyday fishing tools, but a surprising number were never used at all and can be found in essentially brand new or mint condition. It sounds like your Grandfather may have brought this one home as a souvenir and kept it as a reminder of his war time experiences rather than used it as a fishing tool.
In general, the Japanese rods do not have a high collector value. Most can be purchased in the $25-$50 range with really good specimens selling closer to $100. I had a mint condition set a few years ago that I sold for $175 but that was really an exception to the general rule. For insurance purposes, you may wish to consider your rod in the $150-$200 range as I am sure you won't be selling it and it will appreciate over time. It is likely of higher quality than the average post war rod and would certainly be impossible for you to replace with the family history it holds."
Russ in Hollywood, FL.
