To estimate a maximum purchase price for the coin in question, we can analyze the provided data:

1. Coin Condition: The coin to be auctioned has a condition of 70 (MBC-). This is an important factor, as coins in better condition tend to reach higher prices.

2. Auction History:
- The average hammer price for similar coins (condition 75) has been 112.14 euros.
- In the past, coins with a condition of 75 have reached hammer prices of up to 140 euros.
- The last auction of a coin with a condition of 80 had a hammer price of 150 euros.

3. Starting Price: The starting price of the coin is 60 euros, which is below the average starting price of 67.86 euros for similar coins.

4. Sales Trends: Of the 14 times this coin has been auctioned, it has sold on 8 occasions, indicating reasonable interest in the coin.

5. Condition Comparison: Given that the condition of the coin being auctioned is 70, which is lower than the conditions of 75 and 80 that have reached higher prices, it is reasonable to adjust the estimated price downward.

### Maximum Purchase Price Estimate:
Taking all these factors into account, a reasonable maximum purchase price could be between 90 and 110 euros. This is based on the fact that, although the condition is lower than the coins that have reached higher prices, the interest in the coin and the starting price are favorable.

Therefore, an estimated maximum purchase price could be 100 euros.