Is every bar exactly 400 ounces?

No. The rules allow the stated range of fine gold content.

Does 995 mean 99.99%?

No. 995 per thousand equals 99.5%; 999.9 per thousand equals 99.99%.

Fine gold content

350–430 fine troy ounces per gold bar.Source: LBMA Technical Specifications; undated rules checked · Checked: 2026-10-25

Minimum fineness

995 parts per thousand = 99.5%.Source: LBMA Technical Specifications · Checked: 2026-10-25

Required markings

Refiner’s stamp, serial number, fineness and manufacture date according to the rules.Source: LBMA Technical Specifications · Checked: 2026-10-25

Is every bar exactly 400 ounces?: No. The rules allow the stated range of fine gold content.
Does 995 mean 99.99%?: No. 995 per thousand equals 99.5%; 999.9 per thousand equals 99.99%.