I am seriously considering the purchase of a Fujinon-W 135mm F5.6 Lens in Seiko B Shutter. It is, at best, single coated - not absolutely sure. I don't know about Seiko shutters other than they seem less popular than Compur. The lens data is inside the rim which indicates it is not a "newer" shutter where the data is around the exterior parameter. Does the "B" in Seiko B indicate the size of the hole in a lens board? If so, what would that be? Any advice to avoid a complete blunder?
I've looked at Kerry's Fujinon pages.