Hi Mike,
Glad that you saw the post and thanks for your comment. This is a very sweet "low mileage" Nikon F and subsequently its really nice to shoot, with everything feeling tight still.
The lens took a while to find, its a very early 1959/60 9 bladed 7 element type which is quite rare. I have a 5cm f2 from '59/60 also with 9 blades. Nippon Kogaku made the 10.5cm f2.5 and 13.5cm f3.5 with the same iris configuration also, right at the start of production. They are hard to find but I think I've just located a 10.5cm to add to the "early" lens collection. I'll post a pic if/when it turns up!
Kind Regards,
Simon