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OK , then it is a Kit Car or Reproduction . The genuine article was made up until 1940 . The 100 stood for it's top speed . The XK120 came out with the new twin cam motor in 1948. Set a new Standard.

Must admit that Replica is really something!

https://en.wikipedia.org/wiki/SS_Jaguar_100

That's interesting! Thanks for the wiki article - love that red Jaguar in the pic