S/H airgun prices have been daft since covid / Brexit and big jump in new prices - it's difficult to gauge but you can still get new quality rifles for what some people think their s/h stuff is worth
A pre cnc HW80 with nicer more polished metal so nicer blueing would not be my choice over a more precise cnc one, albeit with slightly lesser finish. Some of the early 80s the rear block wasn't even true to main cylinder internally, hence the venom solution of machining a guide in that was centralised. Out of early 80s I've seen or had, more were more trouble than they were worth having done the rounds on forums and been tinkered with by people who just didn't really know what they were doing. Just my opinion. I'd have a new one anyday over an ancient one, but do favour the older pre star nut barrels, in 22 anyway for sure _