If you're a Paneristi, a real Panerai Fan, you would go on the 40.
Have a look on the post I made on this watch, you will understand why it overclasses the 172.
To make it short, this watch is a mystery, a LE which is not classified in the LE category, which doesn't even have the LE packaging, which was destined to certain markets, to test this kind of combo.
We were in 1998 / 99.
The 172 is a superb watch, which will have your preference if you don't specially care about Panerai, I mean, if you're not a real Panerai fan.
A superb watch, but which historically can't fight against the 40.
Best,
Nicolas
This message has been edited by amanico on 2010-09-30 22:44:14