Apple Watch SE (1st generation)
 
To find your case size and more information, check the engraving on the back of your Apple Watch.
 
Apple Watch SE (GPS)

40mm case (Model: A2351)
44mm case (Model: A2352)
Space Grey, Gold or Silver Aluminium
Ion-X glass, Retina display and ceramic back
 
Apple Watch Nike (GPS)

40mm case (Model: A2351)
44mm case (Model: A2352)
Space Grey or Silver Aluminium
Ion-X glass, sapphire crystal, Retina display and ceramic back with Nike logo
 
Apple Watch SE (GPS + Cellular) Aluminium

40mm case (Model: A2353 North America; A2355 Europe, Asia-Pacific and China mainland)
44mm case (Model: A2354 North America; A2356 Europe, Asia-Pacific and China mainland)
Space Grey, Gold or Silver Aluminium with a red ring on the Digital Crown
Ion-X glass, sapphire crystal, Retina display and ceramic back
 
Apple Watch Nike (GPS + Cellular)

40mm case (Model: A2353 North America; A2355 Europe, Asia-Pacific and China mainland)
44mm case (Model: A2354 North America; A2356 Europe, Asia-Pacific and China mainland)
Space Grey or Silver Aluminium with a red ring on the Digital Crown
Ion-X glass, sapphire crystal, Retina display and ceramic back with Nike logo
 
Apple Watch SE (1st generation) - Technical Specifications