Chances are they will have standard m42 mounts...guessing they are zenits or industars?
They copied the praktica from east Germany...there’s one or two that are better than average but most are going to be ornaments these days.
Stick a photo or two up and I’ll let you know what you’ve got but it’s 99% certain they are going to be 35mm film....you can still get these developed at a few places but the seals might not be lightproof anymore.
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