The Grammer Guitar brand was conceived in the 1960s by country musician Billy Grammer. Grammer founded the RG&G Company (Reid, Grammer & Gower) in 1965 with Clyde Reid and J.W. Gower. RG&G made the Grammer guitar from 1965 until 1968 (building approximately 1000 instruments in total). RG&G devoted their efforts into perfecting a single dreadnought acoustic model designed for flat picking and The Grammer Guitar soon earned a reputation amongst the leading country guitarists of the time The factory's Nashville location meant a steady stream of star players stopped by for a visit.

Around 1967/1968 RG&G experienced some cash flow difficulties due in part to high production costs and exacting quality control standards. The company was then sold to Ampeg. Almost immediately a fire destroyed the Grammer factory in downtown Nashville. A new modern factory was built down the street from the old one and the product line was expanded to five models. The company was renamed Grammer Guitar, Inc. (GGI). GGI produced the Grammer guitar until 1972. The factory and any remaining stock was bought in 1972 by dobroist Tut Taylor and his son Mark.

When under Ampeg ownership Grammer had an impressive list of celebrity endorsees:

Roy Acuff
Rusty Adams
Rex Allen
Ernie Ashworth
Jack Barlow
Compton Brothers
Geezinslaw Brothers
Osborne Brothers
The Wilburn Brothers
Archle Campbell
Henson Cargile
Bill Carlisle
Bill Carlisle, Jr.
Johnny Cash
Tommy Cash
Wilma Lee &
Stoney Cooper
Jimmy Covert
Guy Drake
Roy Drusky
Terry English
Lester Flatt
Dick Flood
Bill Floyd
Curt Gibson
Claude Gray
Merle Haggard
Tom T. Hall
Stan Hitchcock
Mark Holly
Tommy Hunter
Ferlin Huskey
Frank ltield
Stonewall Jackson
Bobby Johnson
Anthony Armstrong Jones
Tommy Lee
Garn Litlledyke
Hank Locklin
Lonzo & Oscar
Bobby Lord
Loretta Lynn
Charlie Louvin
Gene Martin
Sam & Kirk McGhee
Bill Monroe
Monument Records
Lee Moore
George Morgan
Oswald
Billy Parker
Dolly Parton
Jackie Phelps
Stu Phillips
Ray Pillow
Kenny Price
Louie Roberts
Leon Rhodes
Royal American Records
Billy Sanford
Jimmie Selph
Dale Sledd
Patsy Sledd
Jimmy Snow
The Rolling Stones
Texas Bill Strength
Peggy Sue
Gordie Tapp
Diana Trask
Van Trevor
Ernest Tubb
Porter Wagoner
Virgil Warner
Harold Weakley
L. E. White
Leslie Wilburn
Doc Williams
Leona Willams
Guy Willis
Smiley Wilson
Don Winters
Skeets Yaney

Link: grammerguitar.com