The Regula Citalux 300 is a 35mm viewfinder camera made under the Regula name by King, a German camera maker active in the post-war decades. It sits in the modest fixed-lens consumer category typical of West German rangefinder and viewfinder cameras of that era.

Auction data for the Citalux 300 is extremely thin: the only recorded UK auction hammer result in our database is a single 2008 sale at £200, which gives a reference point rather than a reliable current market value. With just one data point, what a Regula Citalux 300 is worth today should be treated as indicative only, and prices in 2026 will depend heavily on cosmetic condition, working shutter, and presence of the original case.