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jeff80
it may be marked (not all were!)
some fitting instructions are at http://veterancycleclublibrary.org.uk/ncl/pics/Simplex%20Fitting%20Instructions%20c1950%20(V-CC%20Library).pdf
On page 3 of this Simplex Spares Catalogue No. 23x you can see which parts are interchangeable.
For the one I have, it must be an early 3 speed 1/8" version, as it has even less facility for adjustment. It is important to get your chainline correct.
Don't try to do it in a hurry as you will soon appreciate why later design changes were made to derailleur design.
Shipping on those Constrictor rims would be another £59.00 for me.