This part was made by General semiconductor but I am not finding anythimng for the device type shown in link below , this manufacturer was bought out by Vishay .
https://www.vishay.com/docs/88912/diodesgroupbodymarking.pdf
Page 4 for part marking callout
SM is a type code
41A is a date code , my best guess is 2004 January A is factory
It could be either part number S07M-GS18 or S07M-GS08 from the data sheet I found below Both are marked with the SM you will have to check the data sheet to see if either of these will work for you .