Hi Geoff and welcome to Beoworld
If you are to offer it for sale in this forum then minimum silver membership level is required to post it in the sales section.
These are definately sought after radios although I'm not sure of the significance of the serial number as I'm no expert but if it is the first one made then it will definately add to the collectability and HERE is the place to offer it to a serious collector. If it is simply a standard issue item then ebay is the best place to gain the best price. Ensure you have a good description & photo's and that it is listed in the correct sections of ebay.
I would be surprised if it sells for less than £100 if all the parts are intact & original.
Chris.
The use of metaphors should be avoided like the plague. They're like a red rag to a bull to me.