I'd like to bump this post as I'm very interested in discovering more about it.
Thanks,
Mark

: Heuer Variable Ratio Drive Allows Calibration Of Halda Odometers.

: Steve McKelvie is a highly respected 'celebrity' on the
: international historic rally scene and writes an informative
: blog about aspects of motorsport.

: His website is
: https://stevemckelvie.wordpress.com/author/stevemckelvie/

: He has found an early Heuer device which calibrates Halda
: Tripmeters and is his most recent post.

: Can anyone help him about the origin of this piece of equipment?