Trick padlock 378
This padlock is 4.7" wide 4.3" tall and 2.2" deep
On one side a hidden
key hole
The key screw out the first shackle.... need a lot of turns ;-)
Now, a second key hole
to find. The second key screw out the second
shackle !
This is the first lock which I found in that system and style !

11-500-1994