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One of two different "engraved" case backs fitted to post smooth backed speedmasters before the stamped versions that started in 1971.

Sometimes called (confusingly) a transitional case back. There seems to be as many new ones out there as the original, this one pictured seems original which is always nice to see. The originals are marked 145.022 as opposed to 145.0022 in the new ones.

They were only fitted for a very short time, sources vary, with six to twelve months offered as production periods, from about 1970. In my opinion they are really quite rare.

Hopefully someone here is wearing a bigger anorak than me and can tell us exactly!
 
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