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Those are normal allen crank bolts with a plastic cover.
I have the period TA toolkit, with the Stronglight / TA specific crank extractor tool to remove them.
Think I paid about £50 for it 10 years ago, which I thought was high but have used it many times over the years, saving one thread at the time!!
Happy to split @Skülly!
And not for to go if you want to come and see it :-)