Please note that the date code system employed by Guiseley-made lamps ran from 01 - 96 on a two-yearly cycle, with 01 - 48 being for even years, and 49 - 96 being for odd years; therefore, exact dates for lamps made at this factory are not known.
Nightlight lamp - date code B7 (February 2007).
Blue-coloured lamp; date code 34 = possibly September 1992 (Guiseley, UK).
Blue-coloured lamp; date code 58 = possibly October 1994 (Guiseley, UK)
Crown Silvered Lamp - for reflector fittings.
Clear 'Permalife' lamp with bayonet cap; date code 87 = possibly March 1997 (Guiseley, UK).
Clear 'Permalife' lamp with E27 cap (Guiseley, UK)
Clear 'Permalife' lamp with bayonet cap and 68 mm envelope (Guiseley, UK). These lamps were specially made following an order by Jeremy:
"In 1997 I approached Crompton about having an 80 mm bulb Permalife made , a Permalife Derby 100 if you like. They couldn't do the big 80 mm bulbs anymore by then, but they offered a 68 mm bulb, still used on crown silvers, 150 Watt lamps and various rough service bulbs. I dealt with a very helpful chap called John Walton and they did me 50 x 60 Watt lamps in a 68 mm bulb. I visited the factory at Guiseley ( now closed down - Crompton make very few lamps themselves anymore ) and saw them being made."
Clear 'Permalife' lamp with bayonet cap (Guiseley, UK)
'Rough Service' lamp with pearl finish - a note on the side of the box mentions that this lamp should not be employed for domestic use. Date code 'Z12'.
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