That conflicts with the entry on Pentaprism which makes no mention of the Rectaflex:
Pentaprism - Wikipedia
(photo caption)
Quote: Zeiss Ikon Contax S with the world's first roof pentaprism on a single-lens reflex camera.
Also within the earlier cited SLR Camera entry there are conflicts:
(photo captioin)
Quote: The Zeiss Ikon VEB Contax S, manufactured in Dresden, one of the two original pentaprism SLRs for eye-level viewing that went into production in 1949. The Italian Rectaflex offered its first production SLR, the series 1000, the same year.
(in body of History section)
Quote: The first commercially produced SLR that employed a roof pentaprism was the Italian Rectaflex A.1000, shown in full working condition on Milan fair April 1948 and produced from September the same year, thus being on the market one year before the east German Zeiss Ikon VEB Contax S, announced on May 20, 1949, produced from September.
Single-lens reflex camera - Wikipedia
Wikipedia is a problematic source at best. One should be wary also when a Wikipedia entry cites another Wikipedia entry.