Stumpjumper owners…. What model year is this……

[abr303]

Hi, can anyone identify this base model stumpy with Deore DX in terms of model year….. had a look in the archives so would I be right in thinking 1991??
UPDATE: Serial no. M01S51756

 

[vtwinvince]

Check the SN, but I think you're close, possibly a '90.