There's no known markers as of now that dictate 100% which are hets and which are not. There are the "tracks" on the belly known as "Pied markers", but many non-het Pieds have those too (including my Normal male). Some breeders hold back the lighter or slightly different looking normals in hopes that they are hets. All in all, theres really no way to tell unless you prove it out by breeding him.
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