Thanks Ian! This is very useful information.
My main concern for not getting into vintage is on servicing. If something goes wrong with the piece, how/where do I get it fixed? Also, the value of vintage pieces can be quite subjective. I've seen varying conditions of MB 139 going for between $2k and $4k and for me I couldn't see the differences between the pieces. Probably that's the learning curve. It's much steeper than modern stuff.