x3 ek2's (good?)

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i bought these x3 ek2's.

would anyone know if they are good(?)

- x2 are unmarked & x1 is mm 25

any help would be great thank.

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images of mm25

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non mm ek2

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last ek2. - non mm

if anyone needs more images please let me know.

thanks again.

[J0hnny]

nice three cross

no2 i can't know which maker perhaps meybauer ???
no3 is unmarked 75 EK2

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thanks for the help