It it is from a standard sized push fit handlamp. It is in good used condition with brass body with a screw fitting to the adjuster shaft & wick as per the photos. It would transform that old lamp v.
BR RAILWAY HAND LAMP SHERWOOD CERAMIC BRASS BURNER 70MM SHAFT STANDARD FIT
RAILWAY BR CARBIDE HAND LAMP
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British Rail BR Midland & Scotland Signal Railway Hand Lamp Lantern LMS 1943?
RAILWAY HAND LAMP SHERWOOD SMALL BRASS BURNER & WICK c 1930 BR SIZE APERTURE
ONE BRITISH RAILWAY HAND LAMP BLUE GLASS SLAT C 1950 BR 12cm x 2.2cm 3 AVAIL