This wing may be ok, a similar wing can be seen in Airtrooper's SAS album (not the Rhodesian album) page 7, third from right top row.
Your wing has nine feathers and eight black rigging lines as JB has stated. Nine feathers are usually associated with Rhodesian SAS wings, therefore yours could be an early Rhodesian wing.
The bottom white thread has been seen on other early SAS wings.
Cheers, Jack.
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