1969 A.I.R. Smog Pump

[wisemanz28]

I'm looking to purchase a 1969 chevorlet smog pump for my 1969 Z28. I did my research and found that I should be looking for a 7801149 pump. I found a original dated pump from a reputable seller and to my suprise it doesn't have the 1149 number cast on the back, but it does have the number 7805650 and the number 69 cast into the case found under the white fan.Why wouldn't the back have the 1149 number cast into it? Is this something that I should pass on? All commets would be appreciated.