Someone over at the UK LF Forum was asking about the relationship between the code printed on a Quickload envelope and that’s marked with orange light on the rebate.
There is a relative relationship between the code on the envelope and that on the film. Once you know one relationship in that batch (the first two letters of the code) you can extrapolate forwards or backwards from that point. The code on the envelope is numbered in decimal, that on the film uses an alpha code using A-J So once you know that BE-3932 on the envelope relates to BE-DJGE you can work back and forth from this point:Envelope Film
I’ve found that this relationship holds true for Velvia (50, 100 and 100F), Provia, and Acros