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 of the highest quality.

2. Auction History:
- The average hammer price for similar coins has been 406.24 euros.
- In previous auctions, coins with a similar condition (75) have reached hammer prices that varied, but some examples are:
- 220 euros (2020-12-16)
- 240 euros (2020-11-19)
- 270 euros (2021-06-22)
- 360 euros (2022-10-19)

3. Starting Price and Average Starting Price:
- The current starting price is 200 euros, and the average starting price in the past has been 162.35 euros.

4. Recent Trends: In the most recent auctions, hammer prices have shown an increase, suggesting a positive trend in interest for this coin.

Based on these factors, an estimated maximum purchase price could be in the range of 300 to 400 euros, considering that the average hammer price has been 406.24 euros and that the condition of the coin is good, but not excellent.

Therefore, a reasonable maximum purchase price could be approximately 350 euros.