Since your guitar has butterbean tuners, plastic pickup covers, a blade-style neck selector, removable bridge covers, blend pot - - - it should be no earlier than 1956. Not to mention the brown tolex case, as opposed to tweed.
basilh wrote:
Mk.1 ~1953-1955 Lollypop tuner buttons, Chrome Pickup covers slide neck selector switches fixed bridge cover and no blend pot.
Known serial Numbers =
(4 neck (ser # 0058) July 1953..26")
(2 neck (ser # 0147) Oct 1953..26")
(2 neck (ser # 0189) Oct 1953..26")
(2 neck (ser # 0282) ? ? ..24.5)
(3 neck (Ser # 0460) ? 1954..26")
(2 neck (ser # 0526) Oct 1953..26") Nov on one neck
(3 neck (Ser # 0612) June 1954..26")
(2 neck (ser # 0708) Oct 1954..26")
(3 neck (Ser # 0930) Mar 1955..26")
Mk.2 ~1955- ? Butterbean tuners, redesigned tuner pan, plastic pickup covers, pushbutton neck selector switches. Removable bridge cover and pickup blendpot.
Known serial Numbers =
(2 neck (ser # NONE) May 1955..24.5")
(3 neck (ser # 0619) Dec 1955..24.5")
Mk.3 November~1956- ?? Butterbean tuners, plastic pickup covers, switchcraft blade neck selector switch. Removable bridge cover and pickup blendpot.
Mk.4 ~1968- ?? Octagonal Schaller tuner Heads, plastic pickup covers, switchcraft blade neck selector switch.Removable bridge cover and pickup blendpot.
Fender used Telecaster knobs on the Stringmaster so the various different Telecaster years will correspond to the Stringmaster years (Approx)