Strap Production mostly simple than dials and cases. but it is also cost a lot of time and works to make a good straps especially for hand-made straps. 

it include raw materials cutting/bonding/stitching marking/stitching/glue/press/polish/seal/paint color/re-polish/logo stamp/final QC.etc

Straps also can be made according different Pantone color and different materials.  

strap process

matte straps

color choice

Dive straps