[pound41]

Having owned several 70-72 blazers and still have several 65-72 chevy cars. In restoring many I have learned to say never say never in what they did at the GM factory. However, If I was a betting man I would say #1 your blazers ignition switch failed very early and was replaced with a new GM switch or failed at sometime and was replaced with a aftermarket and someone had GM keys made for it. Just ordered and had cut a set of GM keys for my 69 camaro. Also if you owned my 71 blazer you might believe that one key worked the doors and ignition and the other GM key worked the hatch and it came that way from the factory. When in 1981 my hatch lock came apart and I went to the GM dealer and got a new GM hatch handle and installed it. Thus 2 different keys