Dave G
2154
Rarely seen this reference…
Picked these up many years ago in the early 2000’s.
The UN Berlin 1 And Berlin 2 Split Second Chronographs (Chronosplit Berlin).
It was created to commemorate the company’s achievement at the Berlin Universal Exposition in 1907.
Was made in several metals, steel, gold and two tone. On bracelet or strap. Note the difference in the dials.
There is a black dial in steel that I think is the one to have.
39mm
I posted about these in 2015:
Available on the marketplace

Reference Guide
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