The bulko's have been reproduced. I received a lead on one of these couple of years ago (sign was in OKC). I was told a story about their grandfather working for Bulko in Chicago. When I put my hands on the sign, there was no doubt it was a reproduction. The damage was self inflicted or new damage that had been "aged".
I would be extremely cautious with the sign pictured......it looks VERY similar to the sign I looked at.
It is funny you mentioned that here is what they told me.
"I have an extremely rare Bulko pump plaque. Bulko or the Bulk Petrolum Corp., was an independent chain of gas stations in Chicago. It was founded in about 1918 by Joseph L Stone, Sr., my grandfather, and sold to Gulf Oil in 1963. At the time of the sale, there were about 40 stations."