To estimate a maximum purchase price for the coin in question, we can consider several factors based on the provided data:

1. Current Condition: The coin has a condition rating of 75 (MBC), indicating a medium-low quality. This may influence the price, as coins in better condition tend to fetch higher prices.

2. Starting Price and Average Hammer Price: The starting price is 70 euros, and the average hammer price in previous auctions is 113.01 euros. This suggests that, generally, coins of this reference tend to sell for above their starting price.

3. Sales History: The coin has been auctioned 98 times, of which 55 have resulted in sales. This indicates considerable interest in the coin, which may increase its value.

4. Previous Prices: Looking at previous hammer prices for coins with a similar condition (75), we can see that they have reached hammer prices that vary, but some have reached 190 euros in the past.

5. Recent Trends: In the most recent auctions, hammer prices for coins of similar condition have ranged between 55 and 190 euros.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 120 to 150 euros. This is based on the historical hammer prices for coins of similar condition and the general interest in the coin.

Therefore, a reasonable maximum purchase price could be 150 euros.