[collectibles] Advertisement 'buttons' or medallions, info requested

I’ve just purchased three different buttons or medallions
from Ebay. They are an inch in diameter, made from brass,
with ‘CVD’ and made in England stamped on the back. On the
front are various Jag designs in enamel with a brass insert
of the typical Jag head logo. They look to be some type of
advertising giveaway from many years ago (50’s, 60’s?). Any
information would be appreciated.–
Bent Bob
Fredericton, New Brunswick, Canada
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–