to the CCF
The word "rare" is a vague adjective that's far too often used to exaggerate financial value. One might better ask if anyone's seen a specimen, knows the mintage, has seen one sell, can find any history on the item .... specifics. IMHO, it's always best for a collector to see what can be learned about a piece, first. Then, pass along the knowledge when ready to part with it and let the marketplace gauge its worth in dollars and cents.
As to the subject piece, I've not before seen one; this, in my sixty years of collecting. Then too, I'm stateside and don't collect this genre. Chances are, there's a CCF member who can provide some research insight.
With coins, financial values tend to be far more stabilized than with exonumia, tokens and medals, etc. In my area of interest, 19th century American merchant tokens, I've witnessed pieces sell for $700 at auction that I'd not pay $50 for. If two people want a "rare" (not easily found) item, the sky's the limit when it comes down to cost. I recently bought a damaged (counterstamped) Indian cent
for 300 times what the average coin dealer would pay. In other words, intrinsic or extrinsic value evolves from knowledge and desirability which can vary greatly from one person to another.