Looks to be in quite good nick Alan. They can be a real pain to strip, clean & reassemble. Mostly pressed steel parts assembled by hand.
In my album there are photos of part of my collection which we drag around the country showing them off at steam fairs etc.
SOD. An Enigma machine is basically a typewriter that swops letters in a seemingly random way ( depends on which set of wheels are fitted) and not a mechanical calculator. We are forever putting people right when they pass by and shout "Ooh look typewriters" even though we have a sign saying "Mechanical Calculators"
regards