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You can use any strip of leather. I've used seat belts. The thing is a "real" strop works better than an old belt. I wouldn't go for that particular "Seal" brand strop myself. You have to understand...

if it is still supple and not cracked and dried out it ought to be good. Hard to say without a more detailed description and maybe some photos. I've got some very old strops that still give good...