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I did some searching on the internet and this is what I think he is referring to. At some point the raised armor strip on the top of the 251/10 was changed from being a continuous curved strip of steel to one that was made of three straight pieces of steel. I imagine to speed production since it would be easier to cut and weld three straight pieces than bending a curve and welding it.

The 250 illustration shows it well. I wonder if the change was made to only the dash 10 or if it was made on all the 251s?