Doris Lee pencil signed 'Blossom Time'

I found this last week at a local thrift store I go to every day - it's by a Doris Lee; who I found easily when I googled her. I also found this is called 'Blossom Time' and supposedly is limited to a run of 250, but it's not numbered?
I couldn't find any of these with a number & am wondering if this is a limited run or was it a open edition? (I've never seen one without a number unless it was a open edition; but those weren't usually pencil signed by the artist)
Can I call this a limited edition of only 250? (because her works seem popular & I am thinking I won't have a problem selling it?)
PS - I believe this is supposed to be from the 1950's? I had a magazine for about 7 years (It's all in the Journey - whose covers were done by Grammy winning artist Jim Warren! (for the album cover he did for Bob Segar's 'Against the Wind' album) & when I would go over the proofs the paper it was on would all had the + on the sides to show where it was to be trimmed - this has the same +'s on the sides; did they do that in the 50's or is this a newer copy that someone got Doris Lee to sign (or worse someone copied her signature!)?
Thanks all

 

I wouldn't call it a limited edition, just printed in a small edition, and state the number printed, and that it's pencil signed. It could be that she found it economically advantageous to print that number, and if the print was popular enough, would have felt free to print more.

 

Ok thanks!

 

Those + marks are not where the paper is supposed to be trimmed but rather are registration marks used to place the paper in the press correctly so that the colors from each run through the press do not overlap. While there might be a signed and numbered edition of 250 out there, yours can only be described as pencil signed.