Record loss its cover somehow how can you tell t

Hi I have a Led Zeppelin 1 LP

I think it could be a 200 grams Quiex, but can see any marks any where on the LP
except " BG "
How could someone know if it is a Quiex copy

other than putting it on a scale which I don't have
QuiexII vinyl is slightly transparent. If you hold a regular LP up to sunlight, you cannot see through it. A QuiexII LP is transparent enough that looking through it in sunlight you WILL be able to see it is slightly transparent.
The above statement is NOT corect.