Caseback for 105.012

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Good evening,

A friend of mine has recently acquired a beautiful Omega Speedmaster Professional 105.012.

The watch is in a good condition. However the caseback is overpolished.

He is looking for an honest caseback for his 105.012.

The current caseback is a 105.012-66 (hf) (see pictures). I am looking for this specific type and year.

I hope someone has a spare caseback in their parts drawer.

Thanks!