Well, it’s slightly less thick than the Series 2/3 (0.7mm), but still thicker than the Series 0-1.
I’ll have to look at them side by side, but the crystal looks the same on both from the profile photos I’ve seen.
Series 4
40mm
Height: 40mm
Width: 34mm
Depth: 10.7mm
44mm
Height: 44mm
Width: 38mm
Depth: 10.7mm
Series 2/3
38mm
Height: 38.6mm
Width: 33.3mm
Depth: 11.4mm
42mm
Height: 42.5mm
Width: 36.4mm
Depth: 11.4mm
Series 0/1
38mm
Height: 38.6mm
Width: 33.3mm
Depth: 10.5mm
42mm
Height: 42.5mm
Width: 36.4mm
Depth: 10.5mm