Fun little guns. Hang a can in a tree and laugh every time you hit it.
I have spent fun afternoons with a Slavia 618 which is similar.
Of course, I am easy to entertain.
David Enoch
Recently bought one (a 618) for my kids, because it is like a 3/4 scale HW30, and I wanted something my (little) kids might be able to shoot offhand. The length of pull is actually close to full size adult guns, but I cut the stock down on mine for my kids.
If it shoots ok, it's worth the $50 - nobody makes a youth gun like this anymore, and they can be fun little shooters. Expect about 400 fps with light pellets (mine really likes Hobbys and JSB 7.33). At 15 yards, I can get about 1" groups, and the open sights are probably the limiting factor.
Enthusiastic plus 1 on David's comment above: I'll readily admit I have spent more time with this than all my other springers combined since I got this a few weeks ago. Shooting cans, random plinking - it's just like being a kid with a BB gun again, but with much better accuracy and without the risk of BB ricochet. No bench, no scope, no micrometer sight adjustments, creepy trigger, low power...it's all up to you to see if you can judge the holdover right and hit that can.
https://www.vzduchovka.info/tag/slavie-619/
so the 619 is a rifled barreled 618 with a sling
some 618 were smooth bore
https://cs.wikipedia.org/wiki/Slavia_(vzduchovka)
now both of these sites need a translator to read but have good info
the price seems very fair for a rifle in that condition and with a sling if that is the original even better