IWS Objective Lens Cover/Filter

[waco16]

This may be a long shot.....
But can anyone help with an early IWS Objective Lens Cover/Filter - the version shown on the attached image?

I have the rubber element, so could possibly make the other parts if a pattern is available for loan

Any help gratefully receivedAttachment 76057

Information

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[Peter Laidler]

They were the death knell of the electronic tube.