If he is basing this view on ETA movements in recognised brand name watches then I can understand it. He is assuming they are oiled, regulated and tested from the factory. However, as The Zigmeister has illustrated the Asian 7750 copy movement shipping in our reps is anything but oiled, regulated or tested. It's a lottery as to what you get...
If he is prepared to strip down, clean, reassemble, oil and regulate for 35 quid then bite his hand off because that's a seriously good price. Who is it BTW, I may have some work for him!