1c-$1.00 1910-11 Official Postal Savings, Panama-Pacific Small Die Proofs (O121P2a-O124P2a, O126P2a).
Complete set, all denominations represented (the 2c Black exists with double line and single line watermark and are not face or color different, therefore no reason to have two 2c proofs)
VERY FINE TO EXTREMELY FINE. A SPECTACULARLY RARE SET OF OFFICIAL POSTAL SAVINGS PANAMA-PACIFIC SMALL DIE PROOFS
Probably only three to five sets known, although we are hard pressed to think of where any of those others reside
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