Based on the provided data, we can see that the coin in question has a conservation grade of 70 (MBC-), indicating that it is in an acceptable but not excellent condition.

Furthermore, in previous auctions, starting prices have ranged between 6 and 18 euros, with estimated prices between 9 and 30 euros. The average selling price has been 23.2 euros.

Given that the coin has been auctioned 5 times in the past and has been sold on all those occasions, we can infer that there is market interest in this reference.

Taking into account these data, as well as the fact that the coin is in an acceptable condition, we could estimate a maximum purchase price around 25-30 euros. It is important to note that this is just an estimate and the final price will depend on factors such as demand at the auction and buyers' willingness to bid on it.