fskywalker
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You can use:
The apollo11 50th end links with a 1.6mm spring bar;
The Apollo 11 50th end links with a slight modification to the end link;
Uncle Seiko (hollow) 20mm end links
A Forstner solid end link (not sure which ones for the 1861 case)
I used the uncle seiko links for a while, they fit just fine but the finish was almost imperceptibly different. I decided that the downside to attempting a modification of the stock endlink was minimal since I wasn't using it anyway. The result is better than with either non-OEM link.
Thanks for sharing! Here my 3861 with the 50th anniversary bracelet (020STZ011628):