1812 EL to Dublin with LOUGHREA / 87

1812 Entire Letter from Loughrea to Dublin with m/s "1/4" in black, with very fine large Mileage LOUGHREA / 87 54 x 13mm in red, reverse with a very fine "Mermaid" code C, double-lined spine without curl. (F/K 24) in pale orange.
Without docketing or filing folds, this EL shows a very nice example of this notoriously difficult postal marking.