Waltax
The Waltax was a series of 4.5×6 folders. Some of them were made by Okada, and some sources say that other Waltax cameras were made by Daiichi.
A wartime ad for the Waltax (visible in this page) showed a 4.5×6 folder copied on the Ikonta, with a folding optical finder, offered for ¥185, case in supplement for ¥7.70. The only company names that appeared in the ad were Nihon Shōkai and Honjo Shōkai (precisely 本庄商会卸部, Honjo Shōkai Wholesales).
Links
In Japanese:
Other: