Yep a very good buy. I haven't bought or sold used cartridges and don't know what the typical mark downs would normally occur, but I know the price you paid on that cart. represents a much much greater mark down than %50.
Dynavectors last. I have a 29 year old Dynavector Ruby 23 which is great. The body is worth about $250 even if it needs a retip. So yes you got a good deal.
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