Greetings from Alaska!
This is an interesting item: an orange-tube University Optics 8x50 finderscope that is convertible from right-angle to straight-through viewing.
This vintage Japanese optic is in excellent condition with just a couple of nicks in the orange paint. Optically, it is superb - bright and sharp. The X-hair eyepiece is a 0.965" barrel size so other eyepieces of that size can be substituted.
The scope focuses via a helical mechanism at the back of the tube. The RA prism unscrews and can be replaced by a straight tube that holds the eyepiece via a friction fitting. Voila! You now have a 50mm telescope with interchangeable eyepieces. Neat!
This is a complete unit including printed instructions. It makes a great finderscope and fits any standard bracket.
$105 shipped by USPS Priority Mail in the USA. International buyers pay actual postage. Paypal or certified funds only.