J6 (D6) 1892 2d on 6d mauve Q Victoria Postage Due surcharged SG Type D2, wmkd CA, perf 14, on 1892 Cover from St. Lucia franked with 1d on 4d (Scott 42, SG 55), this is one of only two such commercial usages we have seen connected to this Grenada Postage Due issue, very rare.
