Talking of bulbs ,I have original bulbs WD marked war time dated 1944 (some you take a chance on what's unpacked) these are single filament 36watt, or 24watt the24watt ones are labelled LV6/MT SBC6volt 12 in a box both have Equal pins, and double contacts These are as tough as a rough service bulb, I leave them around on the bench, maybe they were built stronger, seem to be very thick filaments' have used them as 12volts seem to last why? three pounds each £25 box plus postage,max one box per sale I only have a few boxes, pm if any one interested, spose should have put this on the for sale side of the site Sorry Henk, Andrew.h.