I definitely remember the Hausmann boutique on Via Condotti.
I remember almost buying a 5127G there over a decade ago. Kind of regret not having bought it. This limited edition is done well. While the dial might not be to everyone's tastes, the addition of the deployant buckle was a smart move. Hausmann has had a few special editions exclusive to their store over the years and I recall a Lange 1, grey dial, white gold, with a solid gold back and a deployant buckle as well. I guess the employees at Hausmann really like deployant buckles and think their clients ought to have one too!