Tandy 1000 (25-1000) is selling on ebay.
https://www.ebay.com/itm/Vintage-Tandy-1000-25-1000-Personal-Computer/132576970373
This seems to be early serial number.
https://www.ebay.com/itm/Vintage-Tandy-1000-25-1000-Personal-Computer/132576970373
This seems to be early serial number.