There were several different 24 inch Sinclair signs. The HC logo, the bars logo for oils and gasoline, a couple different Opalines and a Pennsylvania. The thing you should be aware of is there were also a couple different curb sign bases also. Some had the base and the upright pipe with a ring to hold the sign that was made out of bent pipe. There were four tabs that held the sign to the ring. Another kind had the base and upright pipe with a trough looking thing to hold the sign. Here is where you need to be careful. If you have a base set up for the four tabs and you get a sign with only two mounting holes, it will not work. Or if you have a base with the trough set up and get a sign with the four mounting holes the spacing may be off. You may want to post a picture of your base to help make sure the sign you get will work in it