Since several models can share one chassis type (for example, the early brown 5G7 Bandmaster, 5G5 Pro and 5G12 Concert), this kind of interpretation is inaccurate.Instead, there were approximately 2000 of these chasses produced, which then ended up as one of the three models in question.The tolex on the earliest versions in this era was pinkish brown and rough textured.There were only six amplifiers covered in tolex originally, the Professional Series: Bandmaster, Concert, Pro, Super, Twin (production halted Feb-May 1960, resumed as the blonde Twin) and Vibrasonic.
They were made in three sizes, 1×8" (one 8-inch speaker), 1×10", and 1×15".
(The nickname is a misnomer, as tweed is a coarse woollen fabric, often woven in a twill pattern.) They were produced for more than a decade.
The first cloth used was an off-white fabric, followed by a horizontal-stripe two-tone pattern, and finally a two-tone twill.
This has the benefit of providing ease of access to the inside while providing a strong top.
Fender largely ceased the twill covering in 1960, though the Harvard continued until 1963, and the Champ until 1964.