OK, there are two issues which may apply.
Some 1171 bracelets taper to 14-mm at the buckle, some are 16-mm.
Later 1171s have taper pins which hold the links in place earlier ones were screwed together.
So, if you have an 1171 and a 1170 which both have 16-mm buckles and both have the early style screw in links they will interchange.
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