The problem is that these things are all old. Most of their value lies in their antiquity; they are very old technology and in general would have little value as test equipment.
This isn't true in all cases. In fact, the stuff is probably indeed useful, just so old that you can buy much better stuff today. So in general, the values are, in my opinion, from about zero to $50 each or a bit more in some cases. The 288 is a nice machine, as is the 7603. I think that Marconi is a TF-1064A, to correct the model number, and a nice instrument.
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