If you're reading this, you'll be aware how rare this is. 

This is original New Old Stock found in the loft of an old electronics shop. 

There are a couple of variants of the 18W transformer, this is the Push-Pull version. 

Please do ask me ANY questions in advance of the sale, for instance winding resistance. 

It will be sent in a fairly large box. The transformer itself weighs around 1.1kg. Shipping worldwide via eBay Global shipping.