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

1. Current Condition: The coin has a condition of 75 (MBC), which indicates that it is in fairly good shape, but not among the best qualities (FDC).

2. Auction History:
- The average hammer price for coins of this reference is 341.94 euros.
- In previous auctions, hammer prices have varied, with some reaching up to 600 euros for coins in better condition (95).
- The last auction for this coin had a hammer price of 366 euros, suggesting that interest in this coin remains strong.

3. Starting Price and Estimates:
- The current starting price is 300 euros, which is a reasonable starting point.
- The estimated price for this auction is 450 euros, indicating expectations that the hammer price will exceed the starting price.

4. Comparison with Previous Prices:
- In previous auctions, coins with similar conditions have had hammer prices ranging from 240 to 600 euros, depending on the condition and market interest.

Taking all these factors into account, an estimated maximum purchase price for this coin could be around 400-450 euros. This is based on the average hammer price and current interest in the coin, as well as its condition. However, since the condition is not among the highest, it is wise not to exceed 450 euros in the bidding.