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This is the only "sign" I have seen so far, and I thought I took a picture of it but apparently I do not know how to use a smartphone.

It was printed on an 8.5x11 sheet of paper, half in English and half in Spanish. In about 72 point font it said "open carry of handguns is not allowed here". In about 8 point font it had the actual required text. I kind of laughed, and was already carrying concealed so I walked right past it (No I wasn't going to test out whether the cops would get called).

What are some of the other worst signs out there?

I haven't seen a 30.07 sign yet.

A city office building here has new .06 and .07 signs posted at the front entry doors. Since there are no courts in the building, and apparently no place for a public meeting, I have strong doubts about their legality.

I saw one in November on a little stop & rob in the SE Fort Worth ghetto that was hand written exactly:

30-07
No open carring