The W9-series 9mm wedge-base miniature incandescent bulb numbers are 922, 921, 912, 906 and 194. The base is all glass, nominally measuring 9.5mm by 2.1mm. The bulb measures 15mm in diameter and is nominally 1.5 inches long. The following generic information comes from donsbulbs.com

Bulb	volts	amps	watts	design life	lumens	length	uses
906	13.0	0.69	8.97	1000 hrs		1.49 in	patio lamp
912	12.8	1.0	12.8	1000 hrs		1.49 in	ceiling lamp
921	12.0	1.33	16.0	1000 hrs		1.49 in	ceiling lamp
922	12.8	0.98	12.5	200 hrs		1.49 in	auto lamp