The first version 1247S retains the best internal craftmanship with quality components and assembling.
A later one, the 1704S, underwent many modifications that allowed savings but not necessarily maintained robustness.
I have yet to encounter a dead 1247S...
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Hp-80: my favorite calculator : 2 versions
The 1247 keys & backbone
The young standard 1704
Full view of the 1704
Cheapy savings on the keyboard...
Both versions side by side
Full view of the 1247
Battery compartment
More savings on the keyboard backbone...
and the cheapie...
The original with nice large copper tracks.
The old, classy 1247
Battery compartment