Where made? I suspect the US. How much worth? Not as much as if it had the proper fuel tank, valve and generator. Those propane adapters work well, but weren't offered with liquid fueled stoves. This is not to imply that complete suitcase stoves are highly desirable. Very few are.
Copied from Terry Marsh's site. Link below. "The Rinnai Mfg. Co., Ltd., Nagoya, Aichi, Japan, made this Model RK-100R two-burner camp stove for Eaton’s of Canada (seen here) and for Montgomery Ward in the US as part of their WesternField brand (see below). " https://tgmarshfacultynoctrl.files.wordpress.com/2018/02/rinnaiwards609500dkgrstovesbushaw.jpg