Hello so tomorrow I am to look at what is supposed to be a 1950 Martin Indiana Alto Sax. The seller gave me alot of info such as he got it when he was 8 back in 73 and the serial number as well. When searching the serial numbers for these saxes I couldn't find this serial number at all. The Indiana by Martin Serial number 49537. Does anyone have any info on this serial number model and when it was made etc etc?