Leave this to a gunsmith
Best left to a gunsmith.
Take it to a competent gunsmith.
The Winchester model 290 belongs to the Winchester 200 series of rifles that were introduced between 1963-1965.The model 290 was discontinued in 1976.
your Winchester model 290 was made as a group of models including the 250,270,255,275 and the 290.these were made from 1963-1976,with the model 290 being the last model made.
your Winchester model 290 was made between 1965-1973.
the best I can do is say that your Winchester model 290 was made between 1963-1976.
remove the buttplate screws, and the buttplate. In the large round hole in the stock is the stock bolt. That is unscrewed to remove the stock from the rifle.
your Winchester model 290 in good condition should be in the range of 200-275 dollars.
Proofhouse.com has Winchester sn tables.
Your Winchester model 290 ranges in price from 90-200 dollars based on overall condition.
Your Winchester model 290 was made from 1965-1976.Winchester chose not to record the serial numbers of the 200 series of rifle they made,of which your is one.These include the models 250,270,290,255,and 275.