of the BTCC tenth coins there are a total of 25 coins (2 of them are already redeemed), which are called 'twins'. 'twins' because on these coins instead of the said 0.1BTC, 0.2BTC are on it - they were simply found twice
the serials are from #W00176 to #W00200
didn't know cygan... interesting info.
Thanks for the DM, hope I can get my hands on one of these coins.