One ducat

I have 43 of these one ducat coins. Dutch heritage coins in a sugar factory in our area, Probolinggo, East Java. However, we are confused about selling it at a reasonable price.

Welcome to Numista!

Ducats were made in several Dutch provinces for 200 years.  The value of each coin will vary according to its scarcity and its condition.  You can find the name of the province somewhere on the coin. 

You can do some research by using a website like CoinArchives.  Here is a search on “Holland ducat gold" showing recent selling prices:  https://www.coinarchives.com/w/results.php?search=Holland+ducat+gold&s=0&upcoming=0&results=100

You can also post photos of a few examples here.

Finally, you should consider whether to sell them yourself, or whether to have an auctioneer sell them on your behalf, especially if any of them are rare dates.