Nice!!!!
Here are some points that may help you pin point the year on the L50.
Model: L-50 Acoustic Archtop
Available: 1932 to 1971.
Collectibility Rating: D- (a very basic non-cutaway model).
1946 to 1971 style L-50.
1932 L-50 introduction specs:
14.75" wide, 17 1/2" long, flat back, most with round sound hole, ebony bridge, short trapeze tailpiece, pickguard glued to top, single bound top and back, dot fingerboard inlays, pearl "Gibson" logo, dark mahogany sunburst finish.
1934 L-50 specs:
19.25" long, most with "F" holes, standard trapeze tailpiece, elevated pickguard.
1935 L-50 specs:
16" wide, arched back.
1936 L-50 specs:
Tailpiece with raised diamonds.
1943 (wartime) L-50 specs:
wood crosspiece on tailpiece (to save metal), 3 on-a-plate tuners, painted or decal "Gibson" logo.
1946 L-50 specs:
Single bound pickguard, single bound fingerboard with pearloid trapezoid inlays.
1949 L-50 specs:
Laminated beveled edge pickguard.
L-50 discontinued in 1971.