ORIGINAL VERSION - Created between 1980 & 1981
The decal has a clear backing and is the same shape as the sticker.

SECOND VERSION - Created in 1983
This version has a white rectanglar paper backing and includes two smaller decals.
(Concert decals included the opening act's name on the smaller decal along with the KLOS decal.)

There may be a third version, created sometime after 1984,
when KLOS changed to the digital frequency reference 95.5

However, I have never seen an April Wine sticker from that third printing.