Poro prism .965 size. Turn your astro scope into a right side up spotter or birder, or use for parts (herschell wedge, atmospheric dispersion corrector) there are a couple nice 45 degree prisms inside. Made in Japan, the main body and eyepiece holder are hard plastic with brass thread inserts.
Asking $20 shipped priority mail in US, paypal, check, MO.
**SOLD** thanks Leonard and AM