Block numbered in two places: 7162, also 1287 on small adhesive label on back of block., Image of a round diagram, with points labeled A, B, C, D, E, and M., "V. Grottenthaler, 402 Library St Phila." – Back of block. Vincent Grottenthaler is listed (as a dealer in boxwood) at this address in Philadelphia city directories from 1869 to 1876.
