Interlock Racing Design Cyclone Mk 1 5 speed.
This one...
https://www.interlocracing.com/shop/ird-freewheel-cyclone-mark-1-5sp-4670?search=freewheel#attr=3236
That's pricey, you can get at the internals with a pin spanner, check for rust, clean up and add some light grease. I'd just buy another £20 sunrace one and avoid spraying water at it and drip some oil in it now and then.
Yes I know,expensive! I did think must be good quality last a life time etc but no. Personally as a brand I'd avoid; now.
@snottyotter started
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Interlock Racing Design Cyclone Mk 1 5 speed.
This one...
https://www.interlocracing.com/shop/ird-freewheel-cyclone-mark-1-5sp-4670?search=freewheel#attr=3236