If you have a pamphlet, it has a model name, or series. There must be links on the net. You can post a link to that in your post, it would be fun to see what you have.
You could search Magnavox Consoles 1958 ...
https://www.google.com/search?q=1958+magnavox+concert+grand&rlz=1C1SQJL_enUS881US881&sxsrf=A...
Link to Magnavox Images
https://www.google.com/search?q=magnavox+consoles+1958&bih=648&biw=1280&rlz=1C1SQJL_enUS...
You might find there is a Magnavox fan club with very knowledgeable members. This is an example
http://www.fisherconsoles.com/index.html
i.e. this is the one I inherited in 1973, made in 1958
http://www.fisherconsoles.com/President%20II.html
I like Magnavox’s separate speaker enclosures better than fixed like the fisher
I stripped the parts, toasted my uncle while roasting the wood in my fireplace. Still use the tube mono-blocks and transferred the speaker drivers into new cabinets. IF you had HORN mid and tweeters, they are worth more,
You could search Magnavox Consoles 1958 ...
https://www.google.com/search?q=1958+magnavox+concert+grand&rlz=1C1SQJL_enUS881US881&sxsrf=A...
Link to Magnavox Images
https://www.google.com/search?q=magnavox+consoles+1958&bih=648&biw=1280&rlz=1C1SQJL_enUS...
You might find there is a Magnavox fan club with very knowledgeable members. This is an example
http://www.fisherconsoles.com/index.html
i.e. this is the one I inherited in 1973, made in 1958
http://www.fisherconsoles.com/President%20II.html
I like Magnavox’s separate speaker enclosures better than fixed like the fisher
I stripped the parts, toasted my uncle while roasting the wood in my fireplace. Still use the tube mono-blocks and transferred the speaker drivers into new cabinets. IF you had HORN mid and tweeters, they are worth more,