Longines 10 Grand Prix - which years?

[Perdurabo]

Hello everyone,
can you please check/complete this list?

Gold Medal 1878 Paris
1. Grand Prix 1885 Antwerp
2. Grand Prix 1889 Paris
Gold Medal 1896 Geneve
3. Grand Prix 1897 Bruxelles
4. Grand Prix 1900 Paris
5. Grand Prix 1906 Milan
6. Grand Prix 1914 Bern
7. Grand Prix ?
8. Grand Prix ?
9. Grand Prix ?
10. Grand Prix 1929 Barcelona

Purpose: Dating of brochures, ads and accessories like the case opener below.
Cheers
Gerd

 

[Radiumpassion]

https://www.vintagelongines.com/

 

[Perdurabo]

Thanks!
Still a bit confusing, Longines never mentions Chicago when it comes to "4 Grand Prix".