The long and sort of it, is this...the Heuer Spirotechnique is legendary - little is known about it’s production dates and numbers, as detailed records from this period are non-existant due to the turmoil of Heuer being sold to TAG. It isn’t featured in any Heuer/TAG Heuer catalogues. Manufacture numbers are presumed to be low. Best guess is that it was available from c1985-90, so Heuer may have commissioned the concept of collaborating with La Spirotechnique, prior to TAG’s takeover.
TEACH YOUR CHILD TO READ - Free! Similar to the vowel quadrilateral, but a visual to help very young students to understand. Speech therapy for vowel sounds. Super Effective Program Teaches Children Of All Ages To Read.