I would guess in that condition,given that it has the original box etc,about $1000.Generally,the 8 3/4 inch barrels go for a bit less than the 6 or 6.5 inch barrels
Are you sure that the gun isnt nickle plated?,rather than stainless,I stand to be corrected,but I dont think that any 29-2,s were stainless
Blue book values are somewhat hit and miss,especially in the US,rather have a look on gunbroker,to see what the public is paying for firearms