Get some Proofhide and lather/rub into top and under sides. Put the saddle in a plastic bar, dark color preferred, and place it in the sun. The sun will warm the whole works up, allowing the leather's pores to expand in size, making it easier for the Proofhide to soak in. After a day or so, repeat a time or two. Polish the saddle with a soft dry cloth afterwards and hope for the best. However, is the leather is all cracked up, nothing much will help.
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"98% of the bikes I buy are projects".