See also the advertising for
Epiphone,
Fender,
G&L,
Gibson,
Gretsch,
Guild,
Hagstrom,
Harmony,
Marshall,
Martin,
Music Man,
Ovation,
Rickenbacker,
Vox,
WEM
Vintage Hagstrom advertisements; 14 adverts covering a period of 13 years, from 1966 to 1979. Click the images to have a closer look.

Discothequing or disc-cutting. You'll move more people with Hagstrom electric guitars and basses
Hagstrom Corvette - 1966

Sound? "We Had No Trouble Being Heard By 55,000 People!"
Hagstrom Electric Guitars - 1967

Long and Slippery
Hagstrom F-12S (H12) - 1967

Folk Rock is a Drag
Hagstrom H-33E - 1967

The Only Eight String Bass
Hagstrom F800 eight string - 1968

Hagstrom/Rosetti exclusive 8-string bass
Hagstrom F800 eight string - 1969

The Swede ...it took us a long time to make
Hagstrom Swede - 1973

The Swede - for the select few
Hagstrom Swede - 1973

Now thats a good ad.
Hagstrom Swede - 1974

The difference between a rod and a rail
Hagstrom Swede - 1975

What Ampeg is bringing to America isnt just another guitar
Hagstrom Swede - 1975

Viking Semi Acoustic Guitar
Hagstrom Viking - 1977

A Hagstrom Star - Larry Coryell
Hagstrom Super Swede - 1979

Super Swede has arrived
Hagstrom Super Swede - 1979
1967 Epiphone Ad featuring a psychedelic fish playing an Epiphone Riviera
1967 Fender Ad - Full Colour Sound
1973 Fender Stratocaster add - The Worlds Favourite Flying Machine
Guitar makers have advertised in music magazines such as Down Beat, Guitar Player and very many more. Some manufacturers advertised widely (Guild, Gibson, Fender) but many more didn't and adverts are few and far between. Here are some of my favourite ads out of the ones i've seen. You can browse through all the images from the category links above, or by manufacturer from the links below.
AMPS
Ampeg, Leslie,
Marshall, Orange, Peavey, Sunn
GUITARS
Epiphone,
Fender,
G&L,
Gibson,
Gretsch,
Guild,
Hagstrom,
Harmony,
Martin, Music Man, Rickenbacker,
Vox