This is a wheel for the later Manors. The first 20 had wheels with the pin in-line, and the spokes not reinforced.

5′ 8″ diam., 18 oval spokes (reinforced near the boss), rectangular inner rim, 4½″ apparent tread.
Hub 18″ face dia., 1½″ (in the middle) out from the tyre, pin between at 15″.

Source: No 7822, Foxgrove Manor, measured direct in February 1995.

Casting: 56.7 mm tread dia., 49.0 mm i/d., hub 1.0 mm out from the tyre.

Casting prices and stock . GWR loco sets, price list

Scan of a casting in a set for a GWR 4-6-0 Manor class . 2-6-2T 31xx, Collett drivers