It wasn't exactly a secret this 1 of 2 1957 Ferrari 625 TRC Spider was going to command an impressive price when it crossed the block at last weekend's RM Monaco event. Even so, exceeding the high end of a pre-auction estimate by approximately $1.5 million is hardly a common occurrence.

One of the two 1957 Ferrari 625 TRC Spiders ever built will cross auction block at RM's Monaco event next month. Although almost unthinkably rare , the 625 TRC Spider is well known to car lovers—it is considered by many enthusiasts to be one of the most attractive Ferraris ever made.