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

1. Current Condition: The coin has a condition of 90 (EBC), which indicates that it is in quite good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Auction History: By observing previous hammer prices for coins with similar conditions, we can see that:
- In past auctions, coins with a condition of 90 have reached hammer prices that vary, but some examples are:
- 2021-06-22: Hammer price of 70 with a condition of 90.
- 2022-09-14: Hammer price of 65 with a condition of 90.
- 2023-01-31: Hammer price of 70 with a condition of 90.

3. Average Hammer Price: The average hammer price for this coin is 130.02 euros, suggesting that, in general, buyers are willing to pay around this amount.

4. Starting Price and Estimated Price: The starting price is 60 euros, and the average starting price is 53.22 euros. This indicates that the starting price is reasonable and could attract buyers.

5. Recent Trends: In the most recent auctions, hammer prices have shown some variability, but overall, coins with a condition of 90 have performed solidly.

Based on these factors, an estimated maximum purchase price for this coin could be between 120 and 150 euros, considering that the average hammer price is 130 euros and that the coin's condition is quite good. This also takes into account the possibility that some buyers may be willing to pay a little more for a coin in such good condition.