The silver "Litecoin", which you can see in the photo, is actually marked as "25 Litecoins" and is actually a .999 pure silver round having real value. The copper "Bitcoins" are simply collected for fun.

You can get them online if you'd really want to collect them, if you can't get them in the Netherlands. I just found this one too: https://forum.bitcoin.com/items-for-sale/1oz-999-fine-silver-bitcoin-rounds-t11339.html I think I'd like at least one of those for my collection too

I'm mostly looking forward to coming across a silver STEEM round to add to my collection though.