Here's a curiosity, or at least I've never seen one before. A Raleigh-built Dunelt with 5 speeds, a Hercules chain guard, a center stand with no markings and Schwinn "Spitfire" tires. Does anyone know who built the center stand and does anybody have an idea where the serial number might be? I've checked the bottom bracket and the top of the seat post, but no luck. From the general style, maybe late 60's?