Based on the data provided, we can observe that the coin in question has had an average starting price of 157 euros and an average selling price of 366.67 euros in previous auctions. Additionally, it has been auctioned four times in the past, sold in three instances and not sold in one.

The conservation status of the coin is described as '70 (MBC-)', indicating that it is in fairly good condition.

Previous prices of this coin in past auctions have ranged between 110 euros and 200 euros as starting prices, with estimated selling prices ranging from 200 euros to 460 euros.

Considering that the coin will be auctioned in the upcoming days with a starting price of 200 euros and taking into account its previous price history, conservation status, and demand in past auctions, an estimated maximum purchase price could be around 400-450 euros. This is considering that the average selling price has been 366.67 euros and that the coin is in fairly good condition.