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), indicating that it is in fairly good shape, but not among the best qualities.

2. Auction History:
- The average hammer price for similar coins in the past has been 59.88 euros.
- In previous auctions, coins with a similar condition (75) have had hammer prices that varied, but some examples are:
- 10 euros (2020-12-15)
- 32 euros (2020-09-17)
- 45 euros (2020-02-12)
- 40 euros (2020-10-21)
- 55 euros (2019-12-11)

3. Recent Trends: In the most recent auctions, hammer prices have shown a range that can reach up to 190 euros for coins in better condition, but for the condition of 75, prices tend to be closer to 30-60 euros.

4. Starting Price: The starting price is 6 euros, suggesting that there is considerable room for the hammer price to be higher.

Based on these factors, an estimated maximum purchase price for the coin in question could be in the range of 60 to 80 euros. This is based on the hammer price history for coins of similar condition and the average hammer price observed.