Looking for a case for a Namiki No. 50 (aka Emperor)

A couple of months ago I acquired a Namiki No 50 Vermillion with Rings. Great pen, but it needs a case and nothing normal fits it. I'll probably eventually have one custom made, but in the meantime I'm hoping to find something that I can "buy it now". I've heard suggestions of cigar tubes, but I know nothing about cigars or how they're measured. Any suggestions for what might fit this thing?

Copying the measurements from Goulet: 174.1mm (6.9") long, 24.6 (1") diameter accounting for the clip.