Most reproduction glass was not made to cheat glass collectors. It copies old glass when those shapes and patterns are attractive to modern buyers.
It utilizes old molds because they are much less expensive than new ones.
Thousands of different patterns, shapes, and decorations exist.
Reproductions have been created for hundreds of years.
Again it would never be found in cut glass but does occur in pattern glass.
Much of the early pattern glass was hand blown into molds.
In new machine made glass, the molten glass is mixed more uniformly and injected into the molds more precisely causing far fewer bubbles to occur.
Look at the areas where the piece touched the table.
There are also inexpensive knock-offs being mass produced today by unscrupulous "repro houses" that are intended only to be good enough to fool the hasty or ignorant buyer for the two minutes it takes to extract the purchase price from them.
It is these pieces that this check list may help you guard against.
Using the magnifier, you should see that the scratches are of varying depths, widths, lengths, and directions.
That is because they all occured at different times and were caused by different pieces of grit.