Nice little rifles, being a bit smaller than the Webley Junior/Diana 22 etc. The sears can be prone to wear so it is another gun that I would prefer a "tired" mainspring or at least one with a few coils collapsed.
As that one looks in quite good nick, (I don't like giving valuations really), maybe £55 at the top end, but if posting, I don't think many people would pay a total of £68. At £40 I would tell somebody wanting to teach a youngster to shoot to grab it quickly.