It will fit your model # 2878.
Length: 115mm/115mm ( approx 4.5 inch )
Width: 20mm at the case lug  and 18mm at the buckle, 23mm at the case lug  and 21mm at the buckle 
Thickness: 8mm tapering to 1.7mm ( Exact like OEM strap )
Top Grade Genuine Premier Leather / American Alligator Grain with Heavy Duty Stitch·
Finest Genuine Calf Leather Lining with Black Stitch on Reverse Side
These new watch strap will bring a fresh new look to your Santos 100 watch and will make your watch look like new.
 
Package:
1 X  watch bands without buckle
 
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