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@Big_Block
I have these rims as well, for a current project. I am advised that they are for clinchers, but you need to run a lower pressure than that stated on a modern tyre. This means you may need a wider tyre (ie 1 1/4") to cope with the lower pressure.
I bought my rims from an authority on vintage bikes and he advised
"All Dunlop SS rims are for what were called wired-on tyres...what are now
frequently called clinchers. There are no SS rims for tubs. Although
Dunlop used to make a full range of tubs they never made any rims for
them."