What is this bracelet for?

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Folks. Google is giving me different stories, could one of you give me a definitive answer.
What watch is this bracelet for?
1153/138 (ammended) with 173 (20mm) ends

Edited:
 
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The number on the bracelet looks more like a 1153/138 to my eyes.
From a quick search here, the 173 end-links fit the Speedmaster Mark II (145.014).
 
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The number on the bracelet looks more like a 1153/138 to my eyes.
From a quick search here, the 173 end-links fit the Speedmaster Mark II (145.014).
You are correct, it is an 8 and that makes more sense.
So a mk2 Speedie.
Excellent, thank you.
 
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I have a correct spare clasp if you are interested
Is the clasp not correct?
It does look added.
 
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Is the clasp not correct?
It does look added.
Based on my experience, the 1153/158 was a generic spare clasp