1808 E Cheltenham to Dublin with superb "Mermaid"

1808 Entire from Cheltenham to Dublin with fine to very fine black CHELTENHAM / 107 mileage, manuscript "1/-" in black, reverse with a superbly detailed "Mermaid" without curl, no code (F/K 23), with double rings, complete feathering and a detailed mermaid.
The Dublin Mermaid handstamp is notorious for poor strikes: this example must be considered superb!