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

1. Coin Condition: The coin has a condition rating of 80 (MBC+), indicating that it is in quite good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Auction History:
- The average hammer price for this coin in the past is 147.07 euros.
- In previous auctions, we have seen hammer prices that varied significantly, ranging from 35 euros to 2000 euros, depending on the condition and demand at that time.
- The most recent auction with a similar condition (80) had a hammer price of 130 euros.

3. Starting Price and Previous Prices:
- The current starting price is 70 euros, which is reasonable given the hammer price history.
- The estimated hammer price in previous auctions for similar conditions has been up to 160 euros.

4. Market Trends: Since the coin has been auctioned 33 times and has had a sell-through rate of 90.9% (30 out of 33), this suggests there is consistent interest in this coin.

Based on these factors, an estimated maximum purchase price could be around 160-180 euros, considering that interest and demand may vary. However, since the starting price is 70 euros, it is likely that buyers will be willing to bid more, especially if there are other interested parties in the auction.

Therefore, a reasonable maximum purchase price could be 180 euros.