I just went an email to Warren (he has a large full size car database), so maybe he can answer your question, but here's what I get:
60-1839 - 1960 4 door hardtop sport coupe
T0128G - 1960 348/250 with 4bbl and Powerglide assembled on January 28th, 1960
01839S174179 - 1960 4 door hardtop sport coupe assembled at St Louis, MO. Yours was the 74,179th car built at that plant.
Ed