@Ukaflyer posted:Hi Bob,
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Over the pond here I have a number of 220V transformers 4B-EX, 8B-EX and 18B-EX. To find one over here is like finding hens teeth due to rarity, yet in the GB guide they mentioned them (or they did on a regular basis about 10 years ago when I got my last one) and the blurb at the front of the guide states that all valuations are based on said items being offered/sold during the compilation for that year. I have never seen on eBay a 220V transformer being offered, I have never seen a 220V transformer on any of the dealers that advertise Flyer I follow, so where are all these 220V transformers that GB claims they see? I will happily purchase more 18B-EX transformers if they are often found for sale in the US.
In your guide Bob do you list these transformers and if so do you have a value on them and how is this value determined if you do?
Yes, the transformers you mention are listed as variations. I did not call out prices on them because of insufficient pricing data. One has to be honest about these things. One does not buy a guide just for prices, but also for the accuracy of the information therein. I caution, however, that rarity and price do not always correlate (inversely) with each other. Desirability is also very important.
The TM guide does not cost a lot. Suggest that you buy a copy of the 2012 edition and you will readily see the extensive listing of variations, set contents, superior accuracy, Lionel production, Gilbert paper, listing organization, etc. and, hence, why the TM guide severely trounces the 'pocket guide' competition. 
Have fun!
Bob
