Those are the updated crystals. Every K2 after SN 2560 has them.
The 4.9135-S is the thing to look for.
73,
Don W3FPR
On 1/6/2021 8:51 AM, Jim via Elecraft wrote:
> K2 serial 397* with KSB2 how do I know if I have matched crystals?
>
> Reading the current crystal markings as follows:
> ECS V
> 4.9135-S
> KOREA J3
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