It's not connected to any specific series/year. It's one of those mail-in offers found on Topps wrappers. Using a little deduction, my guess is it's from around 1973. The Seals used that logo for only four seasons, 1970-1973. The Flames entered the league in 1972. So the two only overlap in 1972 or 1973 season. But I found a wrapper from the 1973-74 Topps issue. The stickers were inside the pack or all 16 could be bought through the mail-in offer.
Someday my cards may double in value and then be worth half of what I paid for them.