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They stopped making Triumphs at Meriden over 20 years (ago)
And if your Bonnie is a 650, they stopped making it over
30 years ago, so it's a Meriden model. Anything neweer than 1991, like your Speedmaster, was made in Hinckley.
If you had a Triumph from the early part of WWII or before, it would have been made in Coventry.
Another good site for Triumph history is
here.