I have a Model 58 with ser #53974V and on the web site http://www.gunsamerica.com/2251/2251-random-14.htm I have found two used ones ranging in price fron $319 with vented rib to $350-maybe this will give you a start- Carl Griffith
Do not see a 543 in any of my references. Sorry-Sportsman is associated with the Remington centerfire rifles in Model 76, 760, and model 78.
There is no model number 3006 or 243 in the Woodmaster line. Check Remington's webiste under the Sportsman's Library.
1930-1947
Should be on the action, Sportsman could be the 48 or 58 semi auto. Sportsman models have little parts left so try not to break any.
apparently $350
apparently $350
75-400 USD
Take it to a gunsmith
Take it to a professional
50-200 or so
According to the Remington website the 78s were produced between 1984 and 1988 Deemoss
Numrich gun parts. Look under Remington SPT 58.