The factory Speedmaster leather strap ?

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Would anyone have the reference number for the leather strap that the Speedmaster strap comes on from the factory?

This reference comes with the leather strap that I am looking for:

311.33.42.30.01.002
 
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The strap should be # 98000245 and buckle 94521813... prior chat on topic here
 
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All very expensive, nearly £500 for the strap & deployant clasp. I got a deployant from Watch Obsession for £35 and a handmade black strap from Steveo Straps for £45,looks brilliant.
 
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I could've sworn the OEM strap tapered from 20mm to 16mm, not 18mm
 
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I could've sworn the OEM strap tapered from 20mm to 16mm, not 18mm
I think the hesalite version is a 16mm clasp to keep with tradition, but the sapphire sandwich model is an 18mm clasp.