Help with reference number?

Scottphoto · Sep 3, 2025

Hello Omega Forums! I was just gifted a funky Seamaster chronometer- seemingly 70’s or 80’s - electronic F300Hz. I can’t find anything exactly the same online ( the case with no bezel that shrouds the bracelet is quite unique). I can’t open the case currently- is anyone familiar with this watch and/or reference number?

Thanks for all your help in advance!

Scott

dsio · Sep 3, 2025

It's an F300 Ref 198.0042 also known as a lobster, there's a Megasonic 720hz variant with the same reference as well. It looks like most of the bracelet is missing as it should have the full segmented lobster-tail shaped bracelet.

There's a thread with some more examples here: https://omegaforums.net/threads/omega-megasonic-conundrum.79028/

Quite an uncommon piece

Scottphoto · Sep 4, 2025

dsio
It's an F300 Ref 198.0042 also known as a lobster, there's a Megasonic 720hz variant with the same reference as well. It looks like most of the bracelet is missing as it should have the full segmented lobster-tail shaped bracelet.

There's a thread with some more examples here: https://omegaforums.net/threads/omega-megasonic-conundrum.79028/

Quite an uncommon piece

thanks kindly!!

Help with reference number?

Scottphoto

dsio

Scottphoto

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