Impossible to answer without a serial number.
The first model 732 guardsman was made from 1959-1973.the second model was made from 1974-1986.
0-100 USD or so
25-80 usd
Seldom excees 100 USD
Best left to a gunsmith
H&R- Better known as Harrington & Richardson, a very prolific American firearms manufacturer.
The letters AT indicates that your H&R shotgun was made in the year 1979.
H. Hargrove Studio638 Arnold Ave.Point Pleasant, NJ 08742Phone: 732-899-2338Fax: 732-736-1808Email - hargroveamerica@aol.comhttp://www.hhargrove.com/
The year of manufacture for the H and R with a serial number of 999 is 1979. The 1979 H and R with a model/serial number of 999 is worth around $250 in good condition.
E A R T H L Year, earth, the, year, are, ale, tale, hale, hat, let, at,
How much does Triple H make a year