Even though an estimated 68 million individual Penny Black stamps were issued, a collector who today owns an unused one has something rare and of value ​ — in the range of $4,200 to $6,800.
ये अक्षर प्लेट बनाने के आख़िरी चरणों में डिज़ाइन के कोने पर चौकोर में हाथ से छिद्रित किए जाते थे ।