Dog Tags Are for Dogs

One allowance here buys 8,990 EXP, which places it 6th of the 6 Lv 20 Goldsmith tradecraft leves that record EXP. The best of them, Music to Their Ears, returns 21,600 EXP for the same allowance, 140% more.

Across that rung the return runs from 8,990 EXP to 21,600 EXP per allowance — 5 distinct figures spanning 140%, so the wrong pick leaves 12,610 EXP of the allowance unspent.

On whether to wait: the best Lv 25 Goldsmith tradecraft leve returns 36,390 EXP per allowance, 68% more than the best on this rung, while the Lv 15 rung behind tops out at 24,790 EXP.

At Lv 20 this data holds 52 leves paying EXP across 2 categories: the 48 Tradecraft ones average 17,352 EXP per allowance, the 4 Fieldcraft ones 113,304 EXP, which puts this leve 48% below its own category's average.

Brass Ring ×1 is a Lv 20 Goldsmith recipe, 2 steps deep through 2 intermediates, costing 5 units of raw material and 4 crystals.

Handing that in returns 1,798 EXP and 21 gil for every unit of raw material the order swallows.

The record carries a repeats value of 2. This site reads that as 2 further turn-ins on the same leve — an assumption, because the source data defines no meaning for the field — which would put the ceiling at 26,970 EXP and 315 gil for the 1 allowance it costs, or 26,970 EXP per allowance.