From my research of Antonio Sereix (b. early 1930s - Spain), I was able to determine a retail art gallery price for your 3/25 limited edition print would be $600-700 assuming good condition.
If you wish to sell, then these are my suggestions.
The internet has your widest pool of buyers. To sell close to retail try the following -
I suggest the you try artbrokerage.com selling
Plus try ads on sites such as
Some like Etsy.com where you can set up your store for free and the selling fees are small or not existent.
A private seller to a dealer can expect 30-60% of retail value.
I hope I have helped you.
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