Hi Bob,
Thanks for the tip.
My plan, if I decide to buy a vintage mic, is to be able to inspect it myself, and use an Escrow service, to guarantee the seller that nothing happens to his mic, or I pay for it. With Escrow, the seller knows the money is there, with no chance of me playing games. Hopefully this is enough for the seller to know I am serious.
Also, I expect to be able to talk to whichever tech person that has serviced the microphone regularly, for a good opinion as to the actual condition of the mic. This way I can better judge if the mic is worth what the seller is asking for it, and if it needs repairs, etc... I don't expect "mint" but I would expect a mic that works and is a good representation of the model.
As another requisite, I expect the seller to give me references of people that can assure me of the integrity of the seller. These references naturally should be people I know as well, so there is no chance that there could be any dodgy stuff going on. Usually, if the tech is known and trusted by the community, he can be one reference.
Cheers,
Nick