For those who have succumbed to the propaganda or coercion, a website specifically devoted to answering this question is here
All you need to do is enter your batch code and it will tell you.
Of course, that requires knowing what your Pfizer batch code(s) are. A reader told us (see this post) that he wasn’t given the batch number and they refused to tell him when asked.
It’s a safe bet that those staffing the drive-in jab centres haven’t a clue, particularly those jabbing kids: “Here sweetie, it’s just a little prick and I’ll give you a KFC voucher/sweets and cakes/$50 cash. No need to tell your parents, it’ll be our little secret.”