Ofmega Mistral: not the most common group set.
Actually, it's not a complete group set, but a few components and completed with some parts from other (CX, Super Competizione) series.
Very eye catching are the crank set and the (composite) rear derailleur and shifting levers.
Note that not all "Mistral" parts are on the group set photo below.
There are also high flange track hubs and track pedals.
This track crank set is 165 mm long and the 5 mm spider and chain ring have a BCD of 144 mm.
The 52T chain ring is narrow, designed for 1/2x3/32" chains.