This is from Kasai website (mfg. in Japan)
The same orthos as sold by University optics are available via our Japanese source Kasai Trading. This japanese orthos are reported to be nearly as perfect as the famous Zeiss and Pentax orthos. We are glad to introduce them now in our program
Only the 12.5mm is left for sale (the 18mm & 9mm are sold)
I’ve decided to go with radians. In perfect condition.
$45.00 including shipping in conus. PayPal accepted + 3% or money order.