Your looking for all the information spelled out for you on 1 sheet of paper, it isn't going to happen. What I'm afraid of is if you do end up buying a repro, you will blame this site for not giving you enough info. You have to take the info supplied and work with it, We can't be at auctions and antique stores with you.
Many signs are Very Obvious repros and there is no need to list everyone of them, Most all of the 12" round porcelain signs are repros, They ARE NOT all going to be listed here, That is something that a Collector has to learn if they want to collect.
Blame this site? No, because I use my own intuiton and if I get one its my own fault. For the most part, I dont buy at shows or malls as its the easiest place to wind up with a repo. Ebay is safest since you have 30days using Paypal to send it back. Im just saying, if you post a pic then also post the REAL SIGN PIC so we can all see the differences between the 2. Simple.