Gauge glass tube. Glass tube from centre of gauge glass. Etched 'Butterworth / ?????' on side. Gauge Glass Tube
Gauge glass tube. Glass tube from centre of gauge glass. Etched 'Butterworth / Invincible' on side. Gauge Glass Tube
Gauge glass tube. Glass tube from centre of gauge glass. Etched 'Butterworth / ????'. Gauge Glass Tube
Gauge glass tube. Glass tube from centre of gauge glass. Etched 'Bishops / Adamant'. Gauge Glass Tube
