That LN - lot number/batch number - is exactly the same that is on my certificate.
Where were you jabbed? I was done at Central Festival, Pattya, on 19/08 and 09/09. Seems that we were all done with the same batch. Maybe the Pfizer donation that came from the USA, which I'm assuming is what we received, was just one lot/batch or maybe it was split and different batches went to different vaccination centres.
Anyway, the shelf life, while refrigerated, seems to be several months - just a few hours once out of the fridge though, which is what you would expect.