stepdown radios

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i have two radios that look exactly the same. but the numbers on the side of the case are different. why are they different?  ZH261135  AND ZH131744   the one has  a ink stamp on the side that reads  USE 14 AMP FUSE ONLY  , the other has no stamp. thanks

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thanks ken. they have round push buttons and the face has a tinted plastic lens with the pointer being  a faded orange. do not know year for sure.

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thanks ken  whats the value chrome is very nice condition. no warping of lens 

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yes thats it

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ken, value?

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thank you ken