I can't decipher the signature, but it looks to be a watercolor (and you wouldn't "embellish" a lithograph with pencil), so I think 12/75 is the date. An edition number is usually (although not always) the opposite side of the signature.
Thanks for the feedback, my eyesight isn't very good these days and I never looked at the work with magnification. When I saw 12/75 as well as the mostly straight edges......I just thought 'litho'. Again, thank you.