There's a lot of other, similar, better foreign heist movies from this period, including the French AND HOPE TO DIE, and the Italian LAST CHANCE which I both found much more interesting than this work.
The main thing this one has going for it is once-huge American star Kirk Douglas in a very meaty central role as a super-suave master thief akin to Clooney's character in the recent "Ocean's 11" series. The supporting cast is also good, though underused, with Gemma as a trapeze artist who Douglas tries to recruit into the life of thievery. Wolfgang Preiss (the guy who always plays Nazi bad guys in war movies) plays the main mob boss with Romano Puppo in a satisfying role as his head thug. Puppo and Gemma have numerous fight and chase scenes which are fun to watch but add absolutely nothing to the plot. Speaking of plot, this one conveniently glazes over all the details of the heist, except on how Douglas deals with the security system's sound recorder. His preparations don't appear to be particularly well informed yet he seems unswervingly confident about the whole thing. Hmmm....
He also has a hot girlfriend/wife/lover/whatever Florinda Bolkan... who repeatedly tells him NOT to go through with the heist or she will leave him. These assertions make absolutely no impact on Douglas, who is single-minded in his pursuit of a big score... and then he is surprised later by all the double-crosses.
It's worth tracking down, but not exactly the most cerebral crime caper from the period. A little more realism would have done this film an immeasurable service.