Question about Dux Ducis Milanese Series

No, this strap is not compatible with the Samsung Galaxy Watch 5.

These are the compatible models:
Samsung Galaxy Watch 3 45 mm,
Samsung Galaxy Watch S3
Huawei Watch GT3 / GT3 Porsche / GT3 Pro 46 mm
Huawei Watch GT2e / GT2 Pro / GT2 Pro Porsche / GT2 Pro ECG
Huawei Watch GT2 46 mm
Huawei Watch GT2 42 mm
Huawei Watch GT 2E
Huawei Watch GT
Huawei Watch3 / Watch3 Pro
Huawei Watch2 Pro
Honor Watch Magic2 46 mm
Honor Watch Magic
Honor Watch Dream
Honor Watch GS Pro
Honor Watch GS 3
Xiaomi Mi Watch
Colour of Xiaomi Watch 2
Xiaomi Watch Colour
Xiaomi Watch S1