Not able to get serial number for Cisco SG5200-52 port gigabit stackable managed switch

Not able to get serial number for Cisco SG5200-52 port gigabit stackable managed switch

Hi Everybody,

We are using Cisco SG5200-52 port gigabit stackable managed switch but I am not able to get its serial number. I  have tried all the different MIBs for Cisco switch but all in vain.