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How do you go about insuring stamp that have not been certified?
You would insure it for what you'd want to be compensated if it disappeared in the mail. USPS postal insurance has a limit ($5,000), you might need to send with a private shipper if you want to insure for more. But again, insuring something for $5K or more will be quite expensive -- you want to make doubly sure you have what you think you have first.
If you directly compared a
known rotary press issue to this issue and got an exact match (the difference is just a fraction of a millimeter, so you need to be very careful doing that), and you are sure it's perf 11, the only way to realize its value is to get the cert, no way around that.
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Also I wouldn't know the price since it is the two stamps connected.
Take a look at the Siegel census page for this issue, you can see some past auction realizations for this issue:
https://siegelauctions.com/display_...s.php?id=235A genuine, fault-free #594 will sell for around $20-30K at auction. With faults, it might only be $2-3K. A pair might realize around double, maybe slightly more or somewhat less (it can be easier to sell two singles than a pair). There are actually some known #594 pairs shown on that page, some of which were broken up to sell as singles. But you can see the value varies greatly depending on condition, so consider condition first.