Does Anyone Know How Many Straight Writing Speedmasters Were Produced?

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An "age restricted " video ? Phill....... 😜
Maybe because of its title "" Its a f*cking mystery! "" (Joe Pesci in JFK by Oliver Stone)
 
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A nice looking A11 with correct bracelet in nr range 3161xxx on C24

 
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SW A11 not the best one but with correct bracelet nr 3131xxxx

 
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And a very nice SW A11 with a Racing dial MOD .... and extract. NICE watch !

Edited:
 
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And a final one as i think the range is pretty clear, and with the 3 exemptions noted and passed on to MWO/watchfid.
A SW A11 with nr 310006xx from the USA.
 
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The case back is engraved with
河田鉄工所
50.1.15

"50.1.15" is written using the Japanese era calendar (Showa 50), which corresponds to January 15, 1975 in the Gregorian calendar, exactly as stated in your listing.

I'm not sure, but this might be the company.:
https://www.kawata-tec.co.jp/index.html

This is just my guess, but I wonder if this Speedmaster may have been a commemorative gift from Kawata Iron Works to an employee who became an adult.

The engraving date, "50.1.15 "(January 15, 1975), was Coming-of-Age Day in Japan at that time. In the 1970s, Japanese companies often cared about their employees and sometimes gave gifts to celebrate important occasions.
As a side note, in Japan at that time, Coming-of-Age Day was a celebration for people turning 20 years old.

Many workers in manufacturing companies at that time started working at a young age, including after junior high school, so celebrating an employee reaching adulthood was not unusual.

The only engraving added to the case back is:
"河田鉄工所 50.1.15"

Since the Speedmaster case back already had many original Omega engravings, there was very limited space for additional engraving. That may be why only the company name and date were added.

I don't know the exact story behind this watch, but perhaps it has a history like this.
Edited:
 
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The case back is engraved with
河田鉄工所
50.1.15

"50.1.15" is written using the Japanese era calendar (Showa 50), which corresponds to January 15, 1975 in the Gregorian calendar, exactly as stated in your listing.

I'm not sure, but this might be the company.:
https://www.kawata-tec.co.jp/index.html

This is just my guess, but I wonder if this Speedmaster may have been a commemorative gift from Kawata Iron Works to an employee who became an adult.

The engraving date, "50.1.15 "(January 15, 1975), was Coming-of-Age Day in Japan at that time. In the 1970s, Japanese companies often cared about their employees and sometimes gave gifts to celebrate important occasions.
As a side note, in Japan at that time, Coming-of-Age Day was a celebration for people turning 20 years old.

Many workers in manufacturing companies at that time started working at a young age, including after junior high school, so celebrating an employee reaching adulthood was not unusual.

The only engraving added to the case back is:
"河田鉄工所 50.1.15"

Since the Speedmaster case back already had many original Omega engravings, there was very limited space for additional engraving. That may be why only the company name and date were added.

I don't know the exact story behind this watch, but perhaps it has a history like this.
Thanks for your explanation !