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 80 (MS+), indicating that it is in fairly good shape, but not the best possible condition.

2. Historical Prices: Looking at previous auction prices for coins with similar conditions:
- In past auctions, coins with a condition of 80 have reached hammer prices that varied, but some examples are:
- 340 euros (2020-11-10)
- 330 euros (2020-07-02)
- 270 euros (2019-12-10)
- 240 euros (2018-05-30)
- The trend shows that hammer prices for condition 80 have been in a range of approximately 240 to 340 euros.

3. Starting Price and Average Hammer Price: The current starting price is 460 euros, which is significantly higher than previous hammer prices. The average hammer price for this coin is 284.7 euros.

4. Demand and Supply: The coin has been auctioned 175 times, with a high sales percentage (167 out of 175). This suggests that there is consistent interest in this coin, which could influence the price.

5. Recent Trends: In recent auctions, prices have shown an increase, especially for coins in good condition. However, the current starting price is quite high compared to historical prices.

### Maximum Purchase Price Estimate
Given that the condition is 80 and considering previous hammer prices, a reasonable maximum purchase price could be in the range of 300 to 350 euros. This is based on the fact that, although the starting price is 460 euros, previous hammer prices for similar conditions do not justify such a high price.

Therefore, an estimated maximum purchase price could be 350 euros.