I’ve had several of each. The 32 is in this watch and the 56 adds a GMT hand, like this steel case Sportura:
Titanium case:
The watches have a large diameter and quite fragile movement that utilizes a thin, large diameter lithium cell that ideally is inserted and removed with a special procedure and tool.
Most of them die during the battery change and it’s cumbersome setting process where you tap battery plus with one tip of a tweezer, and a sequence of other contacts to set day, month and year.
The movement “brain” then takes care of day, month, year, leap year, etc. YouTube has plenty of videos that show how you to do it.
From what I understand the global inventory of movement parts is almost depleted, though I did get my Sportura rebuilt by Seiko in the US a couple years ago.
I have this gray one too, which I bought for spare parts (the bracelet) but it no longer works. 
At least now I have spare hands, crystal, case parts.
Mike