Thanks for posting more pictures and the information about the importer to Finland.

Your question about Kawamura is what I am trying to find out. I assume that the frames were built by Kawamura but I do not know for sure. Some one needs to compare the Nishiki/Kawamura frames with serial numbers that start with "E" to the Finland frames.

The serial numbers that start with "E" (for Europe?) seem most common in the Netherlands and Sweden.

Nishiki's in Denmark have another serial number format to conform with Danish law. In Denmark the Nishiki Importers were: Taarnby A/s and Nordisk Cykelfabrik A/S.