I depend on which reference 861 Speedmaster you desire. A 145.022-68 thru 145.022-78 is collectable and supply is shrinking. With these years you need to be more careful.
The later 145.022 861 are more abundant and easier to find. In addition, there is less of a chance that the post 78 watches would be missing key components thru service or donoring for an older watch. There are plenty of nice 861 watches that pass thru Ebay. As always, consider watches from established sellers, with good pictures and (if possible) are returnable.
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