The LP says A1 and B3 what does this mean


Hi
I have a Pink Floyd LP WYWH
and the it says A1 on side 1 and B3 on side 2 , does anyone know what that means. This is stamped on the wax part of the LP , made in the UK
macallan25
Are you sure a disc isn't missing? I have severalSalbums that are pressed with Side 1 and Side 3 on one LP and sides 2 & 4 on the second LP so you can cue up the second side and mix with no interruption. This goes for rock records not DJ/Techno albums.
There were 13 sets of stamper codes for the first release of WYWH in the UK.

Yours is a very early pressing and depending on the series of letters and numbers after A1 and B3 could be anywhere between the 1st and 7th pressing.

Hang on to it.