There is a diamond mark sold per bottle, 12AX7 compatible sphere, smooth plate, measured value 46 (rejected value 32) with original box, there is a print of The Fisher (US), but I determined that it was TELEFUNKEN ECC83 based on the structure and there is darkening on the bottom ※The measured value indicates the GM value measured by the testing machine TV-7 (Kojima Yosuke)
Accessories: original box