darryl allen

I found out that they were made at a thermo brick factory in Sulfer Springs TX which opened in 1901. Im not sure how old these are but I got a few. I sold 10 the other day for 30, he was a brick collector.

https://tshaonline.org/handbook/online/articles/hrt16?fbclid=IwAR2XO7nOwbWC1f4TSYIp1ry-7IfYBI4U_No7Wtf8iYqecueIVkR667Qqrh8

I have a friend who gave me over 100 of these thermo bricks. Are they worth any value? She said they are older then she is, and she is 74. They came from a old building in Mt. Pleasant TX. When i googled, I couldnt find one brick with the word thermo ingraved in it. Please let me know anyone!!