Republic Counterstamped "Santos Dumont Museum Opening" 960 Reis 1957 MS62 PCGS, Rio de Janeiro mint, KMX-CC13.2 Type XIII countermark (UNC Details) on João Prince Regent 960 Reis 1815-R (cf. KM307). Issued by the Santos Philatelic Society in 1957 to celebrate the opening of the Santos Dumont Museum. HID09801242017 © 2023 Heritage Auctions | All Rights Reserved

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