To estimate a maximum purchase price for the coin in question, we will consider several factors:

1. Coin Condition: The coin has a condition rating of 70 (MS-), indicating that it is in acceptable condition, but not among the highest quality. This can influence the price, as coins in better condition tend to fetch higher prices.

2. Auction History: The coin has been auctioned 105 times, of which it has sold 96 times. This indicates good demand and consistent interest in the coin. The average hammer price in the past has been 114.28 euros, providing a reference point.

3. Recent Starting and Hammer Prices: In the most recent auctions, starting prices have varied, but the average starting price is 65.03 euros. However, the hammer price can be significantly higher, as seen in previous auctions.

4. Price Trends: By observing the hammer prices from previous auctions, it can be noted that at times the coin has reached hammer prices exceeding 100 euros, especially in higher condition grades.

Given all this, an estimated maximum purchase price for this coin, considering its condition and price history, could be around 120-140 euros. This is based on the average hammer price and the price trend in previous auctions for coins of similar condition.