1125 would work if the last links are near the size of the end links and lug width. 1125 is exactly the same in every way as 1171 including style, shape and period correctness (except the modern 1171). They were both available for different lug widths as well, so watch out for it or you may get a 1171 with too small last links.
Both are not correct for modern Speedmasters anyways, so there's no point switching from one to the other.
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