Help needed about original production drawings

[db6]

Hey
I hope this is in correct area and sorry if it's not.
I've been considering purchasing some original production drawings and need any info I can get as I'm unsure if they are copies or completely original.
How can I tell the difference?
Are they all signed by artist?

They are available through an animation gallery but want as much info as I can get before purchasing as I have found some absolute beauties

Thanks in advance

 

[Santo]

It's hard to answer this without context, production drawings of what? Movie/TV show? Disney/Major Studio?

I don't think it's unheard of to have a true original and then well produced replicas slightly modified/autographed.

Much of it will come down to the type of drawing, the distributor and how reliable the certification is.

 

[db6]

Hey, it's drawings from family guy and the Simpsons from fox.
Found out a little more that there may be similar drawings as they are used in pre production etc
I guess they are similar to a animation cell where there are similar but none the exact same
Still look pretty damn kool