Dave, I always thought the tonearm had a family resemblance to the TOTL Micro Seiki tonearms. I cannot recall their model designations, but the bearing housing on those tonearms appears very similar to that seen on the L07J.
Chakster, IMO, Dave got a steal if he paid only $2700 for a good L07D. I paid around $3500 for each of two that I have owned. After living with the first one I bought for a few years, I bought the second because it was so unbelievably "like new" and because it included the correct original Kenwood peripheral ring and record weight. After owning two for a while, I sold the one that was in lesser condition, but it was still very nice and ran perfectly, having been fully restored electrically by Howard Stearn (the L07D guru). Based on performance, even $5000 is well below the cost-effective price point. But you don't have to pay that much, which is the beauty of it.
I'll stick with $2000 as being a very fair price for what you're looking at, if it is indeed NOS.