Omega Seamaster L-6287 - wrong case back or wrong dial?

Hi all,
This SM is advertised as L-6287 model (evident from the case back). However my research showed that L-6287 model did not have the numerical indices (3-6-9-12). Serial number of the movement shows 1959.
This dial I found on model 165.009 / 14761 which has rather beefy lugs - Steel Omega Seamaster Ref. 165.009 vintage wristwatch, circa 1962 - Black Bough | Ludlow
So it seems that the dial does not correspond with the case.

Could that be a frankenwatch or is my assessment incorrect?

Many thanks!

Thanks - I wasn't aware (and struggled to find) a match of that serial number with the numeric dial.

I assume you mean that the condition is irreversible and no "clean-up" is possible on this watch.

Watch is garbage, Well worn and very poor condition. Gold filled back is worn through and someone bent the lugs to fit the bracelet

Wouldn't touch it