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@rodabod
That'll probably be a 6-speed freewheel, not a cassette which fits to a freehub, depending on the year of your rear hub.
Rear spacing should be 126mm, so a 7-speed freewheel should do the trick.
8-speed would require 130mm rear spacing, so I personally wouldn't bother, plus 8-speed freewheels have disadvantages due to the axle stress they cause.
I'd look for decent Shimano or later Sachs models if it is indeed a freewheel. The Shimano 105/600 and Dura Ace models are good. The later Sachs models also use the Shimano tool. Regina are also good, but require a Regina-specific tool.
Have a look on your rear sprockets to determine what make the current block is, and to figure out what tool you need.