This is the first I've heard of Romano Martegani -- where (hopefully in NYC) would one find such an awesome shoe?
When I was in Italy a couple of weeks ago, detailing the shoes for next season, I was introduced to a man who has a small shop in NYC and was working with Martegani as well. I am not sure where his shop was, but I had the impression he was in Manhatten somewhere. The shop carried a single, Italian name as it's trademark. However, he carried shoes that were not the same as these - more like Moreschi type production. As has been talked about alot recently, the Italians have a great capacity to produce a wide variety of footwear, as per a client's request. these particular shoes are, as far as I am aware, only available thru my shop: www.francos.com
I do not hold a patent on the product though, so it ceratainly could be detailed by another store here, I am just not aware of any. I am pretty sure I would be told, however.