They can all be saved.
As you read the rest of this post please bear in mind I have a preference to restore razors to original condition… that is: reuse the original scales and fittings whenever possible, others will have there own opinions... that's good, the more opinions you get... better for you… so here goes.

The first one has quite a bit of rust around the tang and without careful restoration the manufacturers mark may be lost, but until one has it in hand it is difficult to tell for sure. Scales will have to be replaced. The blade face however will easily clean up and should make a great shaver.

The scales on the second one appear to be Bakelite. Bakelite is brittle material, and though there is a very small piece missing from the scale at he pivot area the scales can also be saved and when polished will look very nice. The blade looks solid, and though there is a slight smile at the toe end of the edge, with careful honing in that area will sharpen up nicely. The etching appears to be deep and can easily saved so you will still have the dark contrasting tint to stand out against a polished steel face.

Third, the steel looks solid and will clean up nicely, the scales will have to be replaced… looks like it would be a nice shaver.

Incidentally you didn’t mention the names of the razors.

As these are heirlooms I would not recommend you attempt to restore them yourself, but if you insist I suggest you pick your favorite and send it to a professional for restoration.

Hope this helps,