CW 45 CORYDORA (armatus CW45)

CW 45 is a deep bodied species, similar to C. armatus. It differs from the
latter by the bright orange spot in the neck. C. armatus never has such
a spot. In contrast to “regular” CW 45 the “Lessex” has black markings
on the soft-rayed parts of the pectoral and the ventral fins. These are
only visible when the fish is observed from behind or from above.

https://www.aquariumglaser.de/en/fish-archives/corydoras_cw_45_lessex_en/