I have this game called Tumbelin - can't find one like it anywhere

I have no idea where this game came from initially. I played it at my father's aunt's house over 30 years ago and then about 20 years ago I bought it at her estate auction.

There are 3 capsule-shaped game pieces that have heavy (presumably lead) balls in them. The capsules flip end ver end and the goal is to land them in the holes at the round end of the board. I've attached a few photos.

I've never been able to find anyone who can help me figure out exactly how old it is (or what it's worth).

Anyone with any information on the game would be helpful.