You are looking at the 

*SONY PUA-1600S/PUA-1600L Tonearm Arm Base Bracket Assembly

Condition: 

May have a few minor sign of use.

Hole diameter:

About 17.5mm

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Express Shipping :   3 - 10 days.

Standard Shipping :   7 -14 days.

Economy Shipping : 10 - 28 days.

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