These coins were described as "model coins" and were as I understand, issued by coin producers as an example of their products and suggesting denominations/coinage types.
The Victorian bimetallic coins produced by Joseph Moore were apparently widely accepted and used as coinage, although they were not legal tender.
The coin you have is one of a series which were produced, which included an 1887 version and an 1897 version, they are not particularly rare, but tend to attract quite a bit of interest. On Ebay, the prices really can fluctuate, due to the lack of information about such pieces, but I would tend to say sell for about £3-15 each plus postage (I have seen a couple go for more and also a bit less!!)
I understand there are numerous varieties for each of the denominations, and that they are listed in a book called "Toy Coins by Dr Rogers".
I have not included them on my site to date, because I have tried to restrict the listings to currency issues. Mainly because it opens up another large area for me to investigate, maybe it is one for the future!!
What it may be worth me doing is adding some simple photos and a brief summary on my FAQ page!!