What model is singer sewing machine serial number AL-000.001?

Singer sewing machines manufactured prior to 1900 have serial numbers consisting of numbers only. After 1900 the machine serial numbers have a single or two-letter prefix. The letters identify the year the machine was manufactured. A sewing machine bearing the serial number AI-000.001 would not exist, as Singer skipped the "AI" prefix as the "I" could be mistaken for the numeral "1". Sewing machines manufactured in 1948 bear serial numbers beginning with "AH" and "AJ", but none bear the prefix "AI".