Your camera is cosmetically in so-so condition, though not as rough as some I have seen. To get an idea of value, completed auctions on eBay is a good resource. From appearances, your camera may need service (the mirror is not supposed to be in the up position). When/if you decide to sell, value would be enhanced if in working condition with a recent clean/lube/adjust (CLA) service. The marketplace on this site is a good place to sell Pentax gear (selling or promoting an auction listing from the forums is not allowed) should you decide to not keep the camera.
BTW...the last photo in the series of posted images is a different camera...Minolta X-700? It looks to be a good example...nice camera
Steve