A very nice Lemania indeed!
Congrats on a great pickup!
I have collected serial numbers with confirmed purchase or dedication dates.
Yours I would date to 1954-1955.
The dial design is very interesting. I have never seen a black version with that pattern before.
What I do have is a cal 4651 Automatic with a similar pattern in silver.
The ref 280KO appears also in my 1956 catalogue.
It came in A-Acier and KO, Gold on Steel.
Note that the reference number is a case reference only. Lemania had a modular and small scale production. You may find a great variety of sweep seconds and sub seconds movements (3000 family) and dial variants for the same case ref.
View attachment 548531
View attachment 548538
Prices in GBP 1956.
And my 4651 Automatic.
View attachment 548532
Cheers.
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