Speedmaster professional straight writing caseback

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speedygrail

·Nov 14, 2020

Does anyone know when these casebacks were used?

 

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wsfarrell

·Nov 14, 2020

Around 1970, serial 3.1--3.2 million.

 

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Dan S

·Nov 14, 2020

You can read more here: https://speedmaster101.com/145-022-straight-writing/

These are definitely vintage, not modern.

 

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speedygrail

·Nov 14, 2020

Looks like you can still get them (according to the article)

 

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Evitzee

·Nov 14, 2020

Still available new as a service back from Omega.

 

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Dan S

·Nov 14, 2020

S speedygrail

Looks like you can still get them (according to the article)

The OP back is original, not service.

 

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Spacefruit

·Nov 14, 2020·Prolific Speedmaster Hoarder

Service backs have different internal markings and longer opening slots