Here is a "makeover" of the Helios 44-2. (and here multicoated). Made only by MMZ (BeLomo) to Minsk in Belarus, I think its particular design is due to Belarusian engineers.
Mechanically (and probably optically) identical to 44-2, the back optical part protrudes the mount the same length, and may damage the mirror if used on a full-frame sensor Canon EOS.