Series 500 compressor. Comes with the original box and docs. There is a mark on the left side of the black frame of the meter (you can see best on the first and last photo). No effect on the functionality, but this is why the “Condition: Very Good”. The compressor runs smooth and silent. On this add included also update valves/tubes: MULLARD 12AX7 - ECC83 REISSUE VACUUM and Siemens ECC82 Smooth Plates. See my other add, if you want to buy without (both include the original valves/tubes as well). Let me know if you have any questions.