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

1. Current Condition: The coin has a condition rating of 80 (MBC+), indicating that it is in quite good shape. This is important because coins in better condition tend to fetch higher prices.

2. Auction History:
- The average hammer price for this coin has been 151.43 euros.
- In previous auctions, coins with a similar condition (80) have reached hammer prices that vary, but some examples are:
- 160 euros (2020-11-19)
- 140 euros (2020-10-21)
- 148 euros (2014-10-29)
- 250 euros (2023-01-31, although this was an auction with a higher starting price).

3. Starting Price: The starting price is 75 euros, which may influence bidder interest.

4. Recent Trends: In the most recent auctions, hammer prices have shown an increase, which could indicate an upward trend in the value of this coin.

Based on these factors, an estimated maximum purchase price could be in the range of 180 to 250 euros, considering that the condition is good and that the auction price history for coins in similar conditions has reached figures in that range.

Therefore, a reasonable maximum purchase price could be 200 euros.