With the NJ cancel book confirming use in 1829-31 range, this is definitely 18 3/4 cent rate for 150-400 miles.
Quote:
so mum named her daughter with the same name, unusual.
Very common for nephews to be named for uncles and nieces to be named for aunts in this era. I would not be surprised to find a Catherine Westfall as a sister to Jacob Westfall.
Postmaster compensation: Wert, The postmaster $ data should be from NEW Brunswick, not Brunswick. Specifically, using 1822 data (which is as close as I could come) New Brunswick had the following "Gross amount of Letter and Newspaper postage" in 1822, and no doubt considerably more by c1830. Not a small office by any means.

