Thank you Klaus,
I actually live in an asian country where such information is rare.
I am actually purchasing this for my own studio usage and am always been intrigued by old microphones.
However, as prices for them aren't cheap nowadays, I would just like to know that my purchase is well spent.
I do understand your point about free information, I actually checked around for your book "the vintage microphone handbook" but can't find them on amazon or any international book seller that could ship it to my country; Singapore. Would you be able to point me to a good direction to purchase them, or if you have an ebook I would gladly purchase it from you.
Lastly, thanks for your verification I feel more confident with my purchase.
Kind Regards!