Are you still seeking assistance on this question?
If you can please let me know an approximate number of tile you have, I can help establish the value. As well, photos of the tile and certificate will be very helpful.
Okay, thank you for the update.
Thank you for the images. Please allow me some time to look these over for you.
I will let you know.
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I do hope you find the information that you seek.
Your question has been open and available to all the experts. I see you are still awaiting a response. It really would not be necessary for you to hire an appraiser to come in to the home and assess the tiles, unless it is a real property or real estate appraiser and the value gets tied into the home or property value. A personal property appraiser assesses objects. The comparables you have found online for $300 for a batch of 20 may be an asking price or a more decorative and earlier dating tile. Bear in mind that an asking price and an actual sale price can be vastly different. In the database of past auction sale records that I use, the high sale prices for encaustic tiles are those with decorative floral or figural motifs from the early 20th century. The type color tiles you have are selling for an average of 50 cents to $1.50 per tile in auction lots.